all kids are different, all the crap about what they should be doing at certain ages is just that crap! Dont follow books they are guidelines and more often than not totally not in touch with reality. Obviously if you do have concerns talk to health visitor or doctor. and as for the other child , i bet hes mum exaggarates a bit, it was proven that 80% of mums exaggarate what their child can do, and dont worry your child could be the next einstein or mozart, we all have our own gifts ,im sure his will be great, good luck with everything. p.s. my son didnt crawl or walk till late either but he could play drums and guitar by 3. as i said they are individuals and have their own unique gifts dont worry enjoy him.