The average weight of a baby boy of 15 months is 10.25 kg, so you can see that your son's weight is well below the average.In fact his weight is almost below the lowest line on the infant growth chart scale. This combined with the developmental issues you raise, make it important that you see a paediatrician.I am not familiar with the suburbs in Joburg, but try and see either Dr Martin Davies or Dr Mervyn Ossip who should be relatively near to where you live
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