Just updating this. Bub is now 5 months old and a hefty 10.7kg. Apart from wind and reflux issues, he's a happy, chatty, giggly bundle of love and cuddles. My biggest concern is him growing so big I can't lift him while he's young. Trying to help him to get to sleep without a carrier is tough on the arms! Especially as sitting down is not allowed for that.

I'm trying not to project ahead of time but I can see him being the size of a 4 year old when he's 2 and the expectations and size vs maturity issues that may bring.