Normal Birth Weight: How Heavy Should Your Baby Be at Birth?

    Normal Birth Weight: How Heavy Should Your Baby Be at Birth?

    Knowing the normal birth weight of babies is necessary for every parent who is expecting a child. It’s always good news for every parent to have happy, healthy babies. But that is not always the case and there are some things that they should monitor, such as their baby’s weight. An underweight or overweight baby shouldn’t be a cause for alarm. However, it is important to know the possible serious health risks related to it. What’s the normal birth weight of a baby? Find out here.

    What is the Normal Birth Weight of Babies?

    Before everything else, we should understand that newborns have varying weights and that there’s a range of what’s considered normal. On average, a healthy newborn baby can weigh between 2.5 kilograms to 4 kilograms.

    But according to World Health Organization’s charts, the median birth weight for a baby is around 3.3 kilograms for males and 3.2 kilograms for females. This would also vary depending on the age of gestation the mother delivers.

    Babies who were delivered earlier than the expected date tend to be lighter and smaller. On the other hand, if a baby was delivered at a later date, they tend to be bigger and heavier than the average weight.

    The one thing that doctors look into is how their weights develop over the following days. Usually, a baby’s weight goes down in the next few days because they lose some of the excess liquid gained from their mother’s womb. Their weight should steadily increase after that.

    What are the Possible Risks?

    It isn’t that big of a concern if a baby is a little under or over the normal birth weight. But again, you should always consult your doctor and monitor how they develop over time. Here are some complications that a newborn might experience if they have birth weight deficiencies:

    Lower blood sugar level

    If a baby was born overweight, there’s a chance that the baby might have a lower than normal blood sugar level. This can cause further complications if it isn’t immediately checked.

    Frequent vomiting

    This is most especially common for underweight newborns. They might tend to vomit or gag on milk if their weight is way below the normal average birth weight.

    Metabolic syndrome

    Another health risk that your child might have in the long run if he/she has an abnormal weight on delivery is metabolic syndrome. Metabolic syndrome is various health risk factors that might be present during child growth including high blood pressure, high blood sugar level, and abnormal cholesterol levels.


    If a baby’s weight drastically increases from their birth weight, then this can cause childhood obesity, especially if it isn’t prevented early on.

    Chances of surviving

    If your infant is significantly underweight and doesn’t seem to be gaining weight over the following days, this can be an alarming case since it might mean that the baby isn’t able to get enough nutrition to survive. You should immediately seek your doctor’s help if you notice your baby not latching or feeding.

    Things That you Should Look Out for

    Again, it’s really hard to determine early on if a baby’s birth weight is a reason for concern since it varies and fluctuates in the first few weeks. But there are some things that you can look out for that might just tell you that there’s something amiss with your newborn baby’s growth.

    Here are just some of them:

    • Check how much your infant drinks milk (newborns usually feed for around 10 minutes).
    • A baby should have around 1-2 wet diapers a day before they are breastfed by their mothers. As soon as they do, it usually jumps to around 6-8 wet diapers a day.
    • Monitor the quality of poop that they have in the early weeks (usually black in the first few days).
    • Check their weight over time. Babies usually lose weight at first, and then gradually increase as the days pass.

    What Can You Do?

    As parents, we can’t avoid worrying about our newborn babies, especially when they are very fragile and vulnerable. So if you are worried about these potential risks or if you notice something concerning, here are some things that you can do to prevent any other major complications.

    • Have a healthy diet during the pregnancy period
    • Look into some pregnancy exercises that you can do
    • Avoid consumption of alcohol/tobacco while you are pregnant
    • Breastfeed your newborn baby regularly
    • Always monitor his/her excretion of wastes
    • Consult with doctor regularly and as needed

    Key Takeaways

    There are many factors that come into play when it comes to a newborn baby’s weight. There are many ways to ensure a healthy baby upon delivery, like doing exercise and eating a proper diet during pregnancy. It’s also advisable for the mother to breastfeed their child in the early weeks. Consult your doctor for any concerns.

    Learn more about Labor and Delivery here.

    Hello Health Group does not provide medical advice, diagnosis or treatment.


    Your Newborn’s Growth, Accessed March 16, 2021

    Infant and Toddler Health, Accessed March 16, 2021

    Fetal Macrosomia, Accessed March 16, 2021

    International Notes Update: Incidence of Low Birth Weight, Accessed March 16, 2021

    Gestational Age, Infant Birth Weight, and Subsequent Risk of Type 2 Diabetes in Mothers: Nurses’ Health Study II, Accessed March 16, 2021



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    Written by Patrick Juanico Updated Jun 20, 2021
    Fact Checked by Hello Doctor Medical Panel