Why Is My Baby Losing Weight After Birth? When to Be Concerned

As a new parent, one of the first things you will notice during your baby’s initial check-ups is how closely their weight is monitored. So, it can be surprising or even worrying to hear that your baby has lost some weight after birth. Rest assured, this is a common occurrence and, in most cases, completely normal. But how much weight loss is normal? And when should you be concerned?

In this blog, we’ll explore why babies lose weight after birth when it becomes a reason to worry and what you can do to help your baby regain their birth weight and thrive.

Why Do Babies Lose Weight After Birth?

It’s natural for newborns to lose some weight in the first few days after birth. In fact, most babies lose about 5-10% of their birth weight within the first week. Here’s why:

1. Fluid Loss

Babies are born with extra fluid in their bodies, which they lose in the first few days. This is perfectly normal, and part of their body is adjusting to life outside the womb.

2. Limited Intake

In the first few days, babies consume small amounts of colostrum, the nutrient-rich milk produced by the mother. While it’s packed with essential nutrients, the volume is low, which might not meet their full caloric needs initially.

3. Adjustment to Feeding

Breastfeeding is a learning process for both mom and baby. Sometimes, it takes a few days for the baby to latch properly and for milk production to increase, which can contribute to temporary weight loss.

4. Meconium Passing

Babies pass their first stool, called meconium, shortly after birth. This also contributes to a small amount of weight loss.

How Much Weight Loss Is Normal?

A weight loss of 5-7% of birth weight in the first week is considered normal for most babies. Some may lose up to 10%, which is still within the acceptable range, provided they regain the weight soon after. Most babies return to their birth weight by 10-14 days of age.

When Should You Be Concerned?

While weight loss after birth is normal, there are instances where it might signal an underlying issue. Here’s when to consult your pediatrician:

1. Excessive Weight Loss

If your baby loses more than 10% of their birth weight, it’s important to monitor it closely and discuss it with your doctor.

2. Slow Weight Regain

If your baby hasn’t regained their birth weight by 2 weeks of age, it’s worth investigating the cause.

3. Signs of Dehydration

Symptoms like a dry mouth, fewer than six wet diapers a day, or sunken soft spots on the head (fontanelles) could indicate dehydration.

4. Difficulty Feeding

If your baby struggles to latch, falls asleep too quickly during feeds, or seems unsatisfied, it could impact their weight gain.

5. Unusual Symptoms

Persistent lethargy, irritability, or yellowing of the skin (jaundice) are signs that something might not be right.

What Can Cause Excessive Weight Loss?

Several factors can contribute to more significant weight loss in newborns, including:

1. Breastfeeding Challenges

Issues like a poor latch, tongue-tie, or insufficient milk supply can result in inadequate feeding.

2. Formula Feeding Issues

For formula-fed babies, improper mixing of formula or feeding schedules can sometimes lead to insufficient calorie intake.

3. Medical Conditions

Conditions like jaundice, infections, or metabolic disorders can affect a baby’s ability to feed and gain weight.

4. Preterm Birth

Premature babies often have more difficulty feeding and regulating their bodies, which can impact their weight.

How to Help Your Baby Regain Weight

If your baby’s weight loss is within the normal range, here are some tips to help them regain their birth weight:

1. Focus on Feeding

Feed your baby frequently, typically every 2-3 hours, or on demand. Breastfeeding mothers should aim for 8-12 feeds in 24 hours to ensure adequate milk intake.

2. Ensure a Proper Latch

A good latch is crucial for efficient feeding. If you’re unsure, seek help from a lactation consultant who can guide you through the process.

3. Track Feeding Cues

Look for signs that your baby is hungry, like rooting, sucking motions, or putting their hands to their mouth. Early feeding cues help ensure your baby gets enough nourishment.

4. Pump If Needed

If milk supply is a concern, consider using a breast pump to stimulate production and offer expressed milk to your baby.

5. Supplement If Advised

In cases where breastfeeding alone isn’t sufficient, your doctor may recommend supplementing with formula. Always follow your pediatrician’s guidance.

6. Monitor Diaper Output

Wet and dirty diapers are a good indicator of your baby’s intake. Aim for at least 6 wet diapers and 3-4 soiled diapers per day by the end of the first week.

7. Skin-to-Skin Contact

Holding your baby skin-to-skin encourages breastfeeding and helps regulate their body temperature and heart rate.

Conclusion

Weight loss after birth is a natural part of your baby’s adjustment to life outside the womb. With proper feeding and care, most babies regain their weight within the first couple of weeks.

Remember, every baby is different, and so is their growth pattern. Don’t hesitate to lean on your pediatrician, lactation consultant, or support network for guidance.

FAQs

Why is my 2-month-old not gaining weight?

If your 2-month-old isn’t gaining weight, it could be due to feeding challenges, like difficulty latching, insufficient milk supply, or not feeding frequently enough. Other reasons might include medical issues like reflux or infections. It’s best to consult your pediatrician to identify the cause and get the right support.

When to worry about baby weight?

You should be concerned if your baby loses more than 10% of their birth weight in the first week, isn’t back to their birth weight by two weeks, or shows slow or no weight gain over time. Additionally, signs like lethargy, irritability, or dehydration are reasons to consult a doctor.

How many kg should a baby gain in a month?

On average, babies gain about 150-200 grams per week, which amounts to approximately 600-800 grams (0.6-0.8 kg) per month during the first few months. However, each baby grows at their own pace, so slight variations are normal. Always check with your pediatrician if you’re unsure.