Babies typically lose weight after birth, before they start to gain. A generally accepted rule of thumb is that a baby can be expected to lose about 3—7 percent of their birth weight during the first 5 days after birth. Parents should expect their baby to return to his or her birth weight by about day Many babies double their birth weight by age 4 to 6 months and triple their birth weight by their first birthday. But babies who gain more slowly or more quickly may be perfectly healthy too.
Your baby's doctor will monitor your baby's growth over time weight, length, and head circumference to ensure that they're getting all of the calories and nutrients they need. At 4 months, weight gain will begin to look different for breastfed and formula-fed babies. Research clearly shows that breastfed babies and formula-fed babies grow at different rates starting at about 4 months of age. Newborns are often weighed throughout their stay in the hospital and sometimes again hours after discharge.
Newborns are then weighed a week after birth and sometimes again at two weeks after birth. If a baby has any health concerns, weight checks may be scheduled more frequently. Endorsed by physicians worldwide, Nordic Naturals products are non-GMO, sustainably sourced, allergen-free and third-party verified for freshness and purity. Average Newborn Weight. Formula-Fed and Breastfed Differences Most newborns will gain about oz a week for the first few months. Reviewed by: Madhu Desiraju, MD.
Larger text size Large text size Regular text size. How Big Are Newborns? Other factors include: Size of parents. Big and tall parents may have larger-than-average newborns; short and petite parents may have smaller-than-average newborns. Multiple births. If you have twins, triplets, or more, you can count on your babies being a bit small. Multiples have to share their growing space in the uterus, and they're often born early, which leads to small size at birth.
Birth order. First babies are sometimes smaller than brothers or sisters born later. Girls tend to be smaller, boys larger, but the differences are slight at birth. Mom's health during pregnancy. Things that can lead to a lower birth weight include a mother with high blood pressure or heart problems; or one who used cigarettes , alcohol , or illegal drugs during the pregnancy.
If the mother has diabetes or is obese, the baby may have a higher birth weight. Nutrition during pregnancy. Good nutrition is vital for a baby's growth — before and after birth.
A poor diet during pregnancy can affect how much a newborn weighs and how the infant grows. Gaining a lot of weight can make a baby more likely to be born bigger than average. Epidurals and intravenous fluids. This may make it appear as though the baby has lost an excessive amount of weight. What is a Growth Chart or a Percentile Chart?
Growth charts are used to help follow and assess a baby's growth. Your baby's weight can be plotted against a weight-for-age growth chart. Historically, these charts have been compiled by measuring the weights of hundreds of different children at each age.
The most common type of growth chart is a percentile chart where these hundreds of weights are then divided into equal groups. These groups are then plotted on a graph or listed in a table. If your baby record book does not contain the World Health Organization growth standards, you may like to print out and put them in your book.
Importantly, the World Health Organization growth standards are based on healthy, exclusively breastfed babies from six countries across five continents. These more accurately show how a normal baby should grow. You can find the World Health Organization child growth standards percentile charts and tables here:. The simplified World Health Organization child growth percentile field tables, which are very easy to read, can be found at: Girls , Boys.
It is the pattern of growth over time, rather than a single measurement or percentile, that is important. The following example explains how you should read a percentile chart:. If a baby's height or weight is 'off the chart' above the 97th percentile or below the 3rd , there is a higher chance of something being wrong and it is wise to check with your medical adviser. In many cases though, all is well. Three in every normal babies will weigh less than the 3rd percentile, often because both parents are small.
Does it matter if my baby doesn't 'stick' to a percentile line? Usually, no. They can and do grow faster or slower at times. From birth to 6 months, larger babies tended to put on weight more slowly on average and smaller babies put on weight more quickly. This may be because birth size relates more to nutritional conditions in the womb than to genetic potential for growth. As this group of children got older, they were much less likely to cross two weight-for-age percentile lines, but it did still happen.
Table 1. Percentage of infants and children crossing 2 percentile lines — weight-for-age.
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