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Average weight for kids at 2 years should be around 28.4 pounds(12.9 kg).
Most of the 2 years kids 95 percent, weigh at least 23 1/2 pounds (10.7 kg) and few boys, 5 percent, weigh more than 33 1/2 pounds(15.2 Kg)
The trend is the same for girls, but they are, on average, one pound lighter.
So their weight are in normal range.
Kids vary tremendously in how much they weigh and in how much is healthy or appropriate for them to weigh.
So there are always exceptions and that a little bit of deviation from what is considered normal is acceptable.
So stop worrying and just enjoy the experience of parenthood.
Hope this helps.
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