Thanks for the replies ladies... it was purely for the fact id save money so once he's 6months I'll try him on it and see if he's okay with it if not I'll go back to the first one xx

There is no real difference between them I would say change at six months if it’s going to save you money but it’s not essential

As keri said they're only made for advertising really as they're not allowed to advertise first milk, I had my first on follow on milk but that was over 4 years ago, my 9 month old is still on first milk but he has had the odd box of follow on when no where has had the first milk in stock, if it's going to save you money then why not, no harm, formulas expensive ha xx

There's nothing additional in the follow on that they actually need.. formula companies created them as a loop hole to be able to advertise (as they aren't allowed to advertise 1st milk). If it's going to save you money then I guess it's worth trying tho! X