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Q: Why does my one-year-old weigh only 6.9 kg when her birth weight was 2.7 kg?

  • Myeongchan Kim
  • Oct 31
  • 2 min read

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.



Question: My one-year-old daughter weighs 6.9 kg, but her birth weight was 2.7 kg. She is also taking calcium supplements. What could be the reason for her low weight gain?


Answer: Hello, I understand you're concerned about your child's weight. You're worried because your one-year-old weighs 6.9 kg now but was born at 2.7 kg, and she's taking calcium supplements. Here are some important things to consider:

Normal Weight Gain:

Usually, a baby triples their birth weight by one year. Your baby started at 2.7 kg, so we'd expect about 8 kg or more at one year. 6.9 kg is a bit less, but not extremely low.

Possible Reasons:

She might not be eating enough food, especially nutritious foods like milk, eggs, fruits, and vegetables. She might have frequent sickness or infections causing slower weight gain. Sometimes the body can't absorb nutrients well, even if the baby eats properly.

Calcium Supplements:

Calcium alone won't significantly increase weight, but it's important for strong bones and teeth.

What You Can Do Right Away:

Feed your child healthy, high-calorie foods more often. Continue giving her breastmilk or formula regularly. Visit a pediatrician or a health clinic soon to check if there are other health issues affecting her growth.

You are doing a great job noticing and caring about your child's growth. Keep it up—you've got this! (This advice is general information and does not replace an in-person medical consultation.)



For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.



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