Thank you for your query.
The physical growth parameters of your son are appropriate for his age. Now the weight gain will not be as rapid at it was in the earlier months, so be rest assured.
A 12 hour sleep for your son is good. Soundness of sleep can vary with individuals and you need not worry on that count.
The colour of the skin does not have much relevance to the iron and calcium deficiency
. You can get his haemoglobin
and peripheral smear examined to know if there is any deficiency of iron.
I hope I have answered your query to your satisfaction.
Wishing your son all the best.
Rajiv K Khandelwal