rayray his head might have been bigger, I know Ashtons was (39cm at birth) but they also have bigger everything elses too I think it is just each baby is different, some love tummy time, (Ashton slept on his tummy from very early on, rolled at 3 months, crawled from 5 months), others hate it. I am very doubtful that it has to do with size as he was 5kg born.

Have you had anymore luck trying anything written here Isabel??