How Much Do Babies This Age Grow?
The first month of life was a period of rapid growth. As a 1- to 3-month-old, your baby will continue to grow at a similar rate, while also gaining 1 to 1.5 inches (2.5 to 3.8 centimeters) in length per month. These are just averages — your baby may grow somewhat faster or slower, and is likely to experience growth spurts as well as times of slower growth.
The amount your baby eats at each feeding will gradually increase and by the end of 3 months, weight gain will slow from 1 ounce (30 grams) to about 2/3 of an ounce (20 grams) a day.
Your doctor will measure your baby's weight, length, and head circumference and track his or her growth pattern on a standardized growth chart (there are different charts for boys and girls). Generally, whether your baby is large, small, or medium-sized, as long as your child's growth pattern stays consistent over time, chances are excellent that he or she is doing fine.
If your baby is born prematurely keep in mind that growth and development should not be compared with that of a full-term child.
Preemies will need to be followed more closely and may need to be weighed weekly during the first months to make sure they are growing properly. They have some catching up to do!
Should I Be Concerned?
If your 1- to 3-month-old is not growing at the expected rate, or the growth rate slows, your doctor will want to make sure your baby is getting enough to eat.
The doctor may ask you about:
How many feedings a day your baby gets. A breastfed baby may feed 8 to 12 times in a 24-hour period; bottle-fed babies usually eat less frequently, perhaps every 3 to 4 hours.
How much your baby eats at each feeding. A baby generally nurses for at least 10 minutes, should be heard to swallow, and should seem satisfied when done. Bottle-fed babies eat about 3 to 4 ounces (90 to 120 milliliters) a feeding during the first month, with an extra ounce (30 milliliters) per feeding for