Breastfeeding Warning Signs and Common Problems to Watch For

Breastfeeding is a natural act… but it doesn't always come naturally. Many parents feel uncertain in the early days and may struggle to trust their instincts. Lack of shared knowledge, guidance, support… Add to that all the "ready-made" advice thrown around, rarely suited to what's actually happening in the moment, and suddenly you have a thousand questions running through your mind. In this context, it can be difficult to tell everyday hiccups from real breastfeeding problems and to spot the warning signs.

To help you see things more clearly, Claire Charlet, who has supported hundreds of families in their breastfeeding journeys as a pediatric nurse since 2014 and as an IBCLC lactation consultant since 2022, shares practical reference points, based on everyday observation, that may indicate breastfeeding could benefit from a little extra support.

• Early Warning Signs to Watch in the First Days
• What Your Baby's Behavior at the Breast Is Telling You
• Warning Signs on the Parent's Side
• Your Breastfeeding Questions About Warning Signs, Answered
• In Summary, Listen, Observe, Trust Yourself

Early Warning Signs to Watch in the First Days

Newborn Weight Loss and When It Is Normal

At birth, a baby's body is full of water, and they need to pass meconium, their first stools, so it's completely normal to see a slight newborn weight loss in the days following delivery. Significant weight loss or delayed return to birth weight should be evaluated by your baby's healthcare provider.

These markers can help identify whether milk transfer may be insufficient:

• A loss of more than 10% of birth weight
• Birth weight not regained by day ten (and from day seven onward, it can already be worth investigating calmly)

"These signs suggest that the baby may need additional intake, for example by offering expressed breast milk supplements after a feed. However, supplements shouldn't be introduced automatically: sometimes a small detail, such as positioning, comfort or the baby's alertness, can change everything," explains Claire Charlet.

How Many Wet Diapers Your Newborn Should Have

Yes, parents spend a lot of time… checking diapers! Color, texture, frequency… they provide excellent information.

"From the first week on, we expect to see at least six well-soaked wet diapers per day and at least three bowel movements. If that isn't the case, it may be a sign that the baby needs more milk."

Breast milk is made up of 88% water, so insufficient milk transfer can explain dehydration and less wet diapers. Again, it is absolutely possible to supplement your baby with your own expressed breast milk, by expressing:

• Manually
• Using a milk collector
• With a manual or electric breast pump

What Breastfed Baby Poop Can Tell You

A breastfed baby's poop varies, and some variations are of course normal, as a baby's digestive system is still maturing after birth. However, a few points deserve special attention:

• Very rare or absent stools after the first week
• Very thick, dry or unusually dark stools, which may indicate signs of dehydration
• Explosive or very watery stools on a daily basis, which may suggest difficulty managing milk flow

Claire Charlet reminds us that "when in doubt, it's helpful to speak with a breastfeeding professional to put everything into context."

What Your Baby's Behavior at the Breast Is Telling You

Have you been told that crying is your baby's only way of communicating? That's a myth. Your baby communicates with you through their behavior, facial expressions and posture throughout the day. Observing your little one and learning to recognize these signals is incredibly valuable.

A Velcro Baby Nursing All Day Long

Some babies feed very frequently. "That's completely normal," Claire reassures. Human babies are, in a way, biologically wired to seek closeness and skin-to-skin contact with their parent, and close to you is where they feel most soothed.

We also know that even in the womb, babies practice sucking and swallowing all day long. But if you feel that:

• your baby never seems satisfied
• they sleep very little or struggle to settle

These may be signs that a bit of extra support from a breastfeeding professional could be helpful.

A Very Sleepy Baby at the Breast

A very drowsy baby who needs to be woken for every feed, and who falls asleep quickly after only a few sucks or swallows, without fully draining the breast, may benefit from support to make a few adjustments and identify the cause of these frequent sleep episodes.

Baby Pulls Off, Coughs, or Chokes at the Breast

In these moments, baby may behave like a "woodpecker," as Claire describes it. "We see them latch, unlatch repeatedly, become restless, swallow awkwardly, have milk leaking from the corner of the mouth, or arch back crying at the breast."

Several causes may be involved, including a baby choking while breastfeeding because of a fast flow. "If the baby coughs or chokes at the breast, swallows the wrong way, and when they pull away the mother sees a spray of milk coming from her breast, it's possible the baby is struggling to manage the flow," she adds.

No need to panic, a few tips and positions can help:

• expressing a little milk by hand before latching, to release the first let-downs
• using semi-reclined positions to slow the flow with gravity

Newborn Spit-Up and When to Mention It

It's common for babies to spit up a small amount of milk right after feeding. Newborn spit up can be normal, especially when the let-down reflex is strong. However, spit-up is still too often dismissed as "no big deal."

If your instinct tells you that the frequency is too high, the amount is significant, or your baby seems very uncomfortable, tell your pediatrician, especially for forceful vomiting, poor weight gain, feeding refusal, breathing problems, or significant discomfort.

Warning Signs on the Parent's Side

Listening to your own body matters just as much as watching your baby, and noticing pain or changes in your breasts is never something to feel guilty about.

Pain During Feeds

Mild discomfort or new sensations during latch-on can be normal, especially when breastfeeding is being established. For example, when baby nurses, the uterus contracts to return to its original size. These postpartum cramps are called "afterpains" and are typical in the first weeks.

"But persistent pain (at the beginning, during, after or between feeds) is not normal," emphasizes Claire, drawing from her experience as an IBCLC.

Adjusting positioning, baby's mouth opening or suction can bring quick relief, and there are also natural ways to treat and prevent sore nipples while you work on the cause. If you find yourself clenching your teeth, tears rolling down your cheeks, or dreading feeds, it's a sign you should reach out to a breastfeeding professional.

Engorgement and Early Mastitis Symptoms

Another warning sign is a breast that feels hard or very tight, or a red, painful area, along with fatigue or chills. This combination may suggest:

• breast engorgement
• or the early stages of mastitis

"Rest, good hydration, frequent on-demand feeds are key. You will very likely need to consult a breastfeeding professional to understand the cause, prevent recurrence and manage discomfort," Claire explains. Recognizing mastitis symptoms early, before the redness, pain and flu-like feeling intensify, makes them much easier to manage.

Your Breastfeeding Questions About Warning Signs, Answered

How Can I Tell If My Baby Is Getting Enough Breast Milk?

It's generally recommended that a baby nurses 8 to 12 times in 24 hours, which is not always easy to track. If you're wondering, "is my baby getting enough milk," several signs can guide you:

• you hear regular swallowing
• your breast feels softer after feeding
• baby has six wet diapers and around three stools per day
• their weight curve is steady, using WHO growth charts based on exclusively breastfed babies

"And of course, you see that your baby is calm and relaxed after feeds," Claire concludes.

When Should You Seek Help?

The simple guideline is to seek help as soon as things no longer feel smooth. If you feel lost, receive conflicting advice, or something feels "off" without knowing why, that alone is already a sign the situation deserves evaluation.

"I don't recommend waiting until it becomes too difficult to consult. It often worsens the situation and becomes more complex to manage. If the mother feels the need, don't hesitate," advises Claire.

Seeking support early can help restore comfortable, peaceful breastfeeding quickly.

I've Been Told to Give My Baby a Supplement. Does It Have to Be Formula?

In some cases, healthcare professionals do recommend offering supplements after feeds. If breastfeeding is your goal, the supplement can be given in addition to a feed, to keep stimulating milk production.

"As a first option, if the family wants to breastfeed, it's important to know that you can absolutely express your own breast milk (by hand, with a milk collector or a pump) and offer it to your baby," Claire reminds us.

So supplementation does not automatically mean powdered formula, unless there is a medical reason, in which case parents will receive detailed guidance from their healthcare team.

How Do I Know If My Milk Is Nourishing Enough?

Breast milk contains the excellent nutrition your baby needs to grow and thrive. Its composition changes throughout the day, weeks and months to adapt perfectly to your baby. Breast milk at noon is not the same as breast milk at midnight! Your pediatrician may recommend supplements based on your baby's age and needs.

So there's no need to worry. The real question is whether lactation has been properly established and whether milk transfer from breast to baby is optimal. After 6 months, solid foods will be introduced, but breast milk remains baby's main food throughout the first year.

How Often Should a Breastfed Baby Nurse?

There is no strict rule, as every mother-baby dyad has its own rhythm. In the early months, it is recommended to nurse at the first signs of wakefulness, to support optimal milk supply.

It is also easier to offer the breast early rather than waiting until baby cries, when latching becomes more difficult. Cluster feeding, meaning more frequent feeds, often in the evening, is common.

And it's important to remember that breastfeeding is not only about nutrition. Babies may also nurse for comfort, reassurance, soothing or sleep. It is limiting to associate nursing solely with hunger.

In Summary, Listen, Observe, Trust Yourself

Breastfeeding is a relationship built between a parent and a baby. The co-parent also has a role to play, and knowing these warning signs helps you stay aware and act early when needed.

Sometimes everything flows. Sometimes a small detail disrupts the balance. Warning signs are there to guide, not to frighten. And most importantly, you are not alone. The right support can make a major difference in a very short time, and you can always connect with other parents in the Mustela Mom community.

Don't hesitate to learn ahead of time, before reaching out, so you can find the professional best suited to supporting your breastfeeding goals. Their guidance will be all the more aligned with your needs and questions.