When you say 'reaching milestones' are you talking about purely physical ability, or alertness and responsiveness as well? If your concerns are mostly about physical development, I'd say not to worry - generally speaking, boys (particularly) can lag way behind in physical and social development in the first few years and then all of a sudden have a series of developmental steps and catch right up.

I know Tommy is only a baby, but I have seen this regularly with my friends children from the ages of 0-7, some of the boys will really seem to be not quite as 'with it' as other children their age, then once they hit 6 or 7 they have a huge catch-up physically, socially and emotionally.

My girls have always been ahead of the pack in development, and now I have a strong little baby boy, and I fully expect him to be one of the slower ones to work through co-ordination and abilities, purely because this is what I have seen with my friends babies. I don't think it's any indication of mental ability or intelligence.

Kerrie