lil'bee

Why do some newborns lose weight?

Body Inside & Out   |   Age: 7 days


Why do some newborns lose weight?

When you and your baby go in for your first wellness check-up after birth, don’t be alarmed if she has lost a little bit of weight. It is completely normal for formula-fed newborns to lose up to 5% of their body weight, and breastfed newborns to lose between 7% and 10% of their body weight in the first 5 to 7 days of life. Most newborns will return to birth weight by their tenth to fourteenth day of life.

So why do newborns lose weight?

In breastfed newborns, a large part of this weight loss is caused as your baby adjusts to the shift in milk content. Colostrum is the first breast milk your body produces, and it has a yellowish color, as well as a higher fat content and more concentrated nutrients than transitional and mature breast milk. Colostrum changes to transitional milk over the first 2 to 5 days, then mature milk by the end of the first couple of weeks. Another reason why both breastfed and formula-fed newborns can tend to lose weight is that they are not born with the skills they need in order to eat, after having spent all their time in the womb receiving what was essentially IV nutrition. Sometimes it takes them a little while to get the hang of it, either by not feeding as efficiently as they could, or by falling asleep mid-feed or sleeping through feedings, which can trick new parents into thinking they're full when really they could use a bit more to eat. Some newborns lose additional birthweight by shedding the water weight gained through IV fluids mom received during labor.

Is there ever any cause for concern?

Your newborn losing weight may seem like a big problem, when in actuality it’s quite common - almost the norm, even. However, if your baby is losing weight, seems overly sleepy all the time, and isn’t producing about six wet diapers, and three or four dirty ones throughout the day, this may be cause for concern. If you are concerned about her weight loss, you can always ask the doctor, as he or she will have a vast amount of experience dealing with baby weight.


 

Sources
  • Julia Bunim. “Study Shows Some Newborns Lose Weight Much Faster than Previously Recognized.” University of California San Francisco. The Regents of the University of California, December 1 2014. Web.
  • Caroline J. Chantry, et al. “Excess Weight Loss in First-Born Breastfed Newborns Relates to Intrapartum Fluid Balance.” Pediatrics. 127(1). Web. January 2011.

More articles at this age

Nourishing foods to support breastfeeding


There's a lot of information out there about how to eat while you're breastfeeding, but what are the important things to keep in mind?

1 week old


A week is a long time for some things. A week-long speech? Brutal. A week-long movie? Unfathomable. A week-long existence so far? Different story.

Sleep in the first 0 to 3 months


You're probably familiar with the lack of sleep that most parents of newborns get, but the newborns themselves don't know the feeling. In fact, for them, the early months are filled with more sleep than a person will ever get again.

Ovia's co-founder Gina Nebesar on her unplanned C-section: "It wasn't what I wanted, but it was still amazingly special."


"I went into the delivery room informed, empowered, and I advocated for my birth plan. Still, there were elements of the experience I didn't fully anticipate."

Your newborn's reflexes


You may have noticed that your baby holds tight to any finger she can grab. This is a natural reflex that your baby's body has developed to help her through the early months of life. your baby has a couple more reflexes up her tiny sleeve, and you can check on them to keep up with your baby's development.

How to manage stress and anxiety during the coronavirus


This is a stressful time for all of us. Here's some advice on how to care for yourself.

Welcome to lil'bee!

It looks like you're using an ad blocker. That's okay. Who doesn't? But without advertising-income, we can't keep making this site awesome. Please disable your ad blocker and refresh this page.

Thanks for understanding 🙏