How to Increase a Newborn Baby’s Weight

There’s scarcely an experience that’s as joyful as bringing your first baby home, but if you aren’t prepared, it can also be overwhelming. Parenting is a challenge because of all the responsibility that comes with it, and it takes time to adjust. Everything becomes a potential stressor and a source of worry, from a baby’s pooping habits to the nightly feeding routines. However, one of the most concerning problems for any parent is slower-than-average weight gain or failure to thrive. Before you start worrying, though, it helps to better understand what really classifies as “failure to thrive,” what’s a healthy newborn baby weight, and how to increase newborn baby weight if required.

Average weight of a newborn baby

On average, the birthweight for newborns in India is between 2.5 and 3.5 kilos when they are born at full term. This is considered a healthy weight range, but it can be affected by factors such as maternal health during pregnancy, maternal nutrition, parental genetics, and the presence of any pregnancy complications, including gestational diabetes, hypertension and infections

In cases of preterm birth before 34 weeks, birthweight will be considerably lower than average, but most babies gain weight and thrive eventually with the right guidance and appropriate newborn care. A birthweight below two kilos is concerning and, in such cases, babies require specialised care in the neonatal units until they begin to show steady weight gain.

It’s also normal for newborns to lose some weight during the first few days following birth, but they regain this weight within two weeks if there are no other health problems, a loss of up to 7–10% of birthweight is generally considered acceptable.

Ideal weight for a newborn baby by age

For any parent concerned about their baby’s weight, it helps to first look at growth charts, so you know what’s considered the ideal weight for a newborn baby and what healthy weight gain looks like. Typically, healthy babies gain about 28 grams a day or 170 grams a week during the first few months of life, which begins to slow down after the fourth month. The baby weight gain range outlines healthy and low weight ranges for infants at key early stages, differentiated by gender.

From birth to one month, a healthy weight is around 3.2 kg for girls and 3.3 kg for boys, while weights below 2.4 kg for girls and 2.5 kg for boys are considered low (approximate values that must be interpreted on growth charts). Between one and three months, healthy weight increases to approximately 5.8 kg for girls and 6.4 kg for boys, with low weight defined as below 4.5 kg for girls and 5 kg for boys. By three to six months of age, healthy weight is around 7.3 kg for girls and 7.9 kg for boys, whereas weights under 5.7 kg for girls and 6.4 kg for boys fall into the low-weight category.

Understanding normal newborn baby weight gain

It’s important to remember that there is considerable variation among babies, not just in terms of birth weight but also in growth rates. Moreover, growth rates are not constant and can occur in bursts, seeming to slow down and speed up suddenly. The rate of growth and weight gain is influenced primarily by nutrition, with genes also playing an important role.

This is why experts advise parents to monitor growth and to focus more on the growth trend rather than the actual weight. Routine paediatric visits are important as they track weight and other growth markers, allowing for early detection of any delays or health problems that require further care.

Common reasons for slow weight gain in newborns

Although there are several factors that can contribute to slow weight gain in newborns, the most common cause is inadequate nutrition or low-calorie intake that may be linked to:

• Poor latching and feeding technique
• Maternal malnutrition and low milk supply
• Inadequate or improper formula preparation

Lower food intake and slow weight gain may also be linked to medical and social conditions:

• Problems like reflux, diarrhoea, metabolic disorders and allergies can impair nutrient absorption and calorie utilisation
• Developmental problems that interfere with swallowing

Having open conversations with your paediatrician will help to identify the underlying causes so that you can work together to resolve the problem.

How to increase the newborn baby's weight safely

Strategies to support healthy weight gain in underweight babies mainly focus on improving feeding routines and techniques. Here’s what you need to know:

• Increase the frequency of feeding, as newborns should feed at least eight to 12 times a day.
• Respond to hunger cues as soon as possible before your baby starts to cry.
• If your baby doesn’t feed at least eight times a day, you’ll need to wake your baby every two hours and encourage feeding. At night, you can do this every three to four hours.
• Delaying feeds and feeding after a baby is already crying is associated with poor weight gain.
• If you’re not sure if your baby is latching correctly and need help with technique, talk to a lactation consultant.
• Maternal nutrition supports milk production, but does not directly increase milk calorie content.

In addition to adopting feeding practices that support healthy weight gain, it’s also important to focus on self-care to improve milk supply and quality if breastfeeding. You can do this by eating a healthy, balanced diet that includes adequate protein and healthy fats, as this will significantly improve caloric intake. Also, make sure to get adequate rest and hydration to support breastfeeding.

Breastfed vs formula-fed babies: Weight differences

The World Health Organisation and the Indian Academy of Paediatrics recommend exclusive breastfeeding for the first six months because of its significant health benefits, but modern infant formula is recognised as a safe and healthy substitute when breastfeeding is not feasible. This said, there are still some differences in growth patterns between breastfed and formula-fed babies.

While breastfed babies tend to experience rapid growth during the first few months, followed by a slowdown, formula-fed babies have slower weight gain in the first two months, but then tend to gain weight more rapidly. This is because formula typically has higher protein and calorie content.

When slow weight gain is a medical concern

Consult a paediatrician if you notice slow weight gain that does not improve with feeding techniques, especially when there are other warning signs such as:

• Lack of appetite or refusal to feed
• Respiratory problems
• Extreme lethargy and sleepiness
• Repeated vomiting or diarrhoea
• Dehydration
• High fever, signs of infection- cold/cough/ irritability, diarrhoea, vomiting

Conclusion

Slow weight gain can be worrying, but most babies catch up with simple, practical steps that you can take at home and with regular paediatric follow-ups. Focus on small, steady improvements and self-care, too, as this will also benefit your baby. With adequate support and care, most newborns quickly regain their footing and establish a healthy growth trajectory.

Frequently Asked Questions

1. How much weight should my newborn gain?

Healthy babies usually gain about 28 grams a day or 170 grams a week during the first few months, but this rate of weight gain gradually declines after four months.

2. How often should I feed my newborn?

Newborns should be fed at least eight to 12 times a day. If your baby doesn’t seem hungry, wake them up for feeds every two hours in the day and every three to four hours at night.

3. When should I consult a paediatrician?

Talk to your paediatrician if weight gain doesn’t improve with feeding changes or if your baby displays any other signs of illness, from lethargy and appetite loss to vomiting or fever, or a downward trend on growth charts.