Baby Weight Calculator based on Birth Weight

Weight Calculator for infants is useful for calculating the ideal weight of your baby during various stages of its development. Babies come in different shapes and sizes; some maybe slim and tall whereas others maybe chubby and short. Whatever be their size or shape, babies are definitely special and unique and taking care of their health is the top priority for all parents. Parents usually compare their babies growth with other babies of the same age. As the baby gains height and weight, their normal growth pattern can be compared with standard growth charts. Every baby should have their own chart maintained by the parents. This is a simple but effective method to the growth and health of the baby.

What Growth Charts Mean

Growth charts and percentiles are just tools that help track the growth of children over time. The 50th percentile doesn’t mean normal. The 50th percentile means average. While some children fall on the average line, many children fall below or above it. So, if your baby is not in the 50th percentile, it certainly doesn’t mean that he or she is not growing at a healthy rate. Many factors contribute to your baby’s height and weight, including genetics, diet, and activity level. Healthy infants are in the 5th percentile as well as the 95th percentile.

WHO and CDC Growth Charts

All growth charts are not the same. The Centers for Disease Control and Prevention (CDC) provide a set of growth charts that include older data and information from a combination of feeding methods. The CDC growth charts are a reference and show how children grew during a specific period in the United States. The World Health Organization (WHO) growth charts contain more data from breastfed babies. Since mothers are breastfeeding more and more and the WHO charts are considered a standard on how children should grow, the CDC recommends using the WHO growth charts for all babies – whether they are breastfeeding or taking formula – during first two years.

Average Newborn Weight

The average weight of a newborn is around 7 to 7 1/2 pounds (3.2 -3.4 kg). But, most full-term healthy newborns weigh anywhere from 5 pounds 11 ounces to 8 pounds 6 ounces (2.6 – 3.8 kg). Low birth weight is less than 5 pounds 8 ounces (2.5 kg) at full-term, and larger than average is a birthweight over 8 pounds 13 ounces (4.0 kg). During the first few days of life, it’s normal for both breastfed and bottle-fed newborns to lose weight. A bottle-fed baby may lose up to 5 percent of his body weight, and an exclusively breastfed newborn can lose up to 10 percent. But, within two weeks, most newborns regain all the weight they have lost and return to their birth weight.

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Many things can affect a newborn’s birthweight.
They include:

How many weeks a pregnancy lasts:
Babies born prematurely are typically smaller, and babies born past their due date may be larger.
Smoking: Mothers who smoke tend to have smaller babies.
Gestational diabetes: Diabetes during pregnancy can lead to a larger-than-average baby.
Nutritional status: Poor nutrition during pregnancy can lead to a smaller baby where excessive weight gain can lead to a larger baby.
Family history: Some babies are born smaller or larger, and it may just run in the family.
Gender: On average, newborn baby girls weight a little less than boys.
A multiple pregnancy: A single baby will likely have a greater birthweight than siblings born at the same time such as twins, triplets, or more.
Gender: Boys tend to weigh slightly more than girls of the same age during infancy.
Type of Feeding: Breastfed babies may not gain weight as fast as babies who take formula.
Activity Level: A more active infant may weigh less.

Average Baby Weight By Month

By one month , most infants will gain about a pound over their birth weight. At this age, infants are not as sleepy, they begin developing a regular feeding pattern, and they have a stronger suck during feedings. On average, babies gain about one pound each month for the first six months. Then, between six months and one year, weight gain slows down a little. Most babies double their birth weight by five to six months of age and triple it by the time they are a year old. The average weight at six months is about 16 pounds 2 ounces (7.3 kg) for girls and 17 pounds 8 ounces (7.9 kg) for boys. By one year, the average weight of a baby girl is approximately 19 pounds 10 ounces (8.9 kg) with boys weighing about 21 pounds 3 ounces (9.6 kg).

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The two charts below show the average weight of babies from one month to one year based on the WHO growth charts. One table is for boys, and the other is for girls. Each chart shows the 50th percentile along with a range from the 3rd to the 97th percentile. These growth charts are for healthy, full-term infants. A doctor may use specialized growth charts for premature babies, or babies born with special health needs.

Remember, this is just a reference. If you have concerns that your child is gaining too much weight or not enough , you should contact the doctor.

Average Baby Length (Height) By Month

In general, during the first six months, a baby grows about one inch per month. Between six months and one year, it slows down a bit to about a 1/2 inch per month. The average length of a baby boy at six months is approximately 26 1/2 inches (67.6 cm), and a baby girl is about 25 3/4 inches (65.7 cm). At one year boys are around 29 3/4 inches (75.7 cm), and girls average 29 inches (74 cm).

Weight Loss and Gain in Babies

While it is normal for a newborn to lose weight during the first few days of life, after that period, weight loss or poor weight gain in a child is a sign of a problem. For breastfed babies, it could mean that the baby is not getting enough breast milk. When it comes to weight gain, breastfed babies are less likely than formula-fed infants to gain too much weight too quickly. Breastfeeding may even help to prevent excessive weight gain and obesity. But, breastfed babies can gain too much if a mother has an overabundant supply of breast milk , the child spends too much time nursing, or solid foods are started early.

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Infant Growth Spurts

Infants don’t grow at a consistent rate. They have times when they grow slowly and times when they shoot up all of a sudden. When they have a big surge of growth in a short amount of time, it’s called a growth spurt . Growth spurts can happen at any time, and they don’t necessarily follow a pattern. Some of the ages that your child may experience a growth spurt are at ten days, three weeks, six weeks, three months, and six months.

During and after a growth spurt, your baby will need more breast milk. Since breast milk is made based on supply and demand, your baby will breastfeed much more often during these times. You may need to breastfeed your baby as much as every hour or two. This increase in breastfeeding tells your body to make more milk . Luckily, these frequent feedings only last about a day or two as your milk supply adjusts to your growing baby’s needs. After that, your child should settle back down into a more regular feeding routine.
Children are individuals. They grow at different rates. It’s difficult to compare one child to another, even if they are brothers and sisters. When you look around at other children, it can be scary if you think your child is smaller than he should be or he weighs more than he should for his age.

Luckily, there is an easy way to ease your fears and find out for sure if your child is growing as expected. You just have to follow the regular schedule for well-child visits that your healthcare provider gives you. Your child’s doctor is the best source of information when it comes to your child’s growth and development. The doctor will weigh and measure your baby each time you see him. And, he will keep track of your little one’s growth and overall health over time. This way, you can feel confident that your child is growing at a normal, healthy rate. And, if there are any issues or concerns, they can be noticed and taken care of right away.

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