It could just be that his how he is IYKWIM? Fast metabolism?
Does he eat a good diet? I guess all you can do is try to get a good balanced diet into him. My DS seems to go through phases with eating. Some weeks he eats like a horse and others he seems to survive on air only. He has just turned 3 and weighs 17kg.
Incorporate high calories foods into his diet. Cheese, milks, yoghurts, have a google of what foods are high calorie.
My DD was sick earlier this year, and didn't put weight on for months. She was frail, weak and looked ill. She had a Staph infection in her digestive tract.
Since then, she's fluttered between being a good eater and a fussy eater, BUT has put on 3 kg's and now weighs 16kg. Finally, she's moving into the next clothes size. We've spent 9-12 months in size 2 clothes now, bring on the 3's!!
Follow your instinct, do something to his diet if you think it's necessary. xx
I think his weight sounds fine. My DS1 is 4 and he weighs around 17kg, my DD is 5 1/2 and weighs about 18-19kg. I don't think he sounds under weight, or skinny. Though I suppose it would depend on his height.
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