Shades - it isn't anything to worry about. Babies grow at their own rate... but I have to add that my 5.5month old DD is currently 6.7kg (or was early Jan) and was 62cm long... now she was 6 weeks prem so should only be just over 4 months old

But just goes to show that there are variances in all bubbas!

My friend has a son who is 5 days younger than DD (but should be 8 weeks older - he was born 2 weeks 'overdue' and DD was 6 weeks early) and when we are together my friend now jokes and tells people her son is 10 months old after I say that DD is almost 6 months old... but compared to DD anyone is big LOL