Baby Size Chart - Babies and Growth

By Cathrine on December 13, 2018 in Blog

It is a wish for every new parent to see her child grow healthy and happy. Even though some babies don’t grow healthy, the majority of them have the privilege to grow with great care and parental love. From helpless newborn to the active toddler, a baby's growth is amazing to watch. It takes just 12 months for a baby to experience incredible transformation. They grow and change at an outstanding pace; each month comes with new and exciting developments. New parents often wonder what to expect next from the growing baby. Also, new parents cannot tell if their baby’s size chart development pace is on target. Instead of focusing on development milestone, parents are advised to remember each baby develops at their own pace.

When a baby reaches one milestone sooner, he may take time to reach another developmental stage because he is busy perfecting the current skill. For example, some babies may say their first word at the age of 8 months, while others may not talk until a little after the one year mark. Walking in most cases begins between the age of 9 and 18 months. Parents should keep those kinds of variations in mind to stop worrying when they find their baby is not developing as they wished.

American Academy of Pediatrics has identified fundamental pillars for baby size chart growth. They have provided new parents with key developmental markers and helpful information.

Below are three-month stages of the first year

0 to three months

A newborn has an average weight of 7-to 7 1/2 pounds that are 3.2 -3.4 kg. A newborn health baby can weigh around five pounces 11 ounces to 8 pounds 8 ounces. The weight of the newborn depends on what the mother has been eating during her pregnancy. The food has a direct impact to baby’s size chart only after birth can the situation be corrected or improved if the bay was born underweight. First three months is the first developmental stage for babies’ bodies and brains. At this stage, the body and brain are learning to adapt to the current world. The baby starts to smile. You should note that earlier a baby starts to smile just to himself, but as three months end he will be smiling in response to your smile.

The other development you will note is that he will begin to raise his head and chest. At this time, his minute muscles are getting into shape, and the spinal cord is starting to become firm. Also, the baby will start tracking objects with his eyes.

As the three-month stage ends, the baby will be taking swipes at or reaching the dangling objects. Even though he will not be able to get them, he will be curious to know what they are.

Four to Six Months

At this stage, babies are busy learning to reach out and manipulate everything within their reach. They are mastering on how to use the things they get a hold of. They can roll over from front to back and vice versa. In most cases, a toddler starts with front-to-back movement. At the period, the baby size chart should indicate 23.6 – 24.7 inches for boys and 23.0 – 24.1 inches for girls. The weight should be 16.2 – 18.8 pounds and 14.8 – 17.5 pounds for boys and girls respectively. Also, he uses the standard crawling on his hands and knees. New parents should not panic if their baby fails to crawl because some babies never move directly from scooting to walking.

The other development you will see is that the toddler starts laughing, babbling, making sounds that almost sounds like a real language. They can move their head back and forth. Also, they can grab objects; manipulate toys and other projects which come on their way. Even though they can manipulate them, the manipulation can destroy the thing they hold, or he can hurt himself. For example, if a child gets hold of a knife, the news can be devastating to the parents.

Seven to nine months

At this age, a baby can get somewhere by rolling himself. The motor system is taking shape as the baby learns to make movements. From 7 months onwards a baby will figure out how to move backwards and forward. He starts to crawl; this includes moving around on his bottom or dragging himself with on his tummy by using his arms and legs. Also, at this stage, they sit without support, and they can respond to familiar worlds like his name. They can respond to some instructions or respond to a word like no by briefly stopping and looking at you. Later, he will start babbling words like “mama” and “Dada.” At this period, the baby size chart should indicate 27.7 – 28.9 inches for boys and 27.0 – 28.3 inches for girls. The weight is for boys and girls respectively.

Ten to twelve months

This is the last developmental stage in a baby’s first-year transformation. The toddler now is not an infant anymore. He looks, and act likes a toddler, but he is a baby in many ways. The good news is that he can feed himself. The toddler can already learn the pincer grasp, meaning that he can hold small objects like O-shaped objects between his thumb and forefinger. The toddler's size chart the height should be 29.2 – 30.5 inches for boys and 28.5 – 29.8 inches for girls. The weight should be 19.8 – 22.9 pounds and 18.2 – 21.4 pounds for boys and girls respectively.

Also, the toddler can move around the house on his feet by holding on to chairs or walls. The average words a toddler can utter at this age are three. If he wants something, he can point at it to catch your attention. They begin pretending to play by copying parents or using objects correctly. For example, he can pretend to use a phone just like he sees you do it.

If you feel that your baby is not meeting developmental milestones, trust your instinct and consult your doctor. Early intervention is the best because you know your baby better than anyone else does. Always remember it is not when your baby sits by himself, say the first two words, what is important is his or her development progressing.

Baby size and growth chart

Age Size Boys Girls
Birth Weight 6.7 – 8.1 pounds 6.5 – 7.8 pounds
Length 19.1 – 20.1 inches 18.9 – 19.8 inches
3 months Weight 13.0 – 15.2 pounds 11.8 – 14.0 pounds
Length 23.6 – 24.7 inches 23.0 – 24.1 inches


6 months Weight 16.2 – 18.8 pounds 14.8 – 17.5 pounds
Length 26.1 – 27.2 inches 25.3 – 26.5 inches


9 months Weight 18.2 – 21.1 pounds 16.7 – 19.7 pounds
Length 27.7 – 28.9 inches 27.0 – 28.3 inches

Toddler size and growth chart

Age Size Boys Girls
12 months Weight 19.8 – 22.9 pounds 18.2 – 21.4 pounds
Height 29.2 – 30.5 inches 28.5 – 29.8 inches
15 months Weight 21.1 – 24.5 pounds 19.5 – 23.0 pounds
Height 30.5 – 31.8 inches 29.9 – 31.2 inches
18 months Weight 22.4 – 26.0 pounds 20.8 – 24.5 pounds
Height 31.7 – 33.1 inches 31.0 – 32.5 inches
21 months Weight 23.6 – 27.5 pounds 22.0 – 26.0 pounds
Height 32.7 – 34.3 inches 32.1 – 33.8 inches


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