Which Similac to use

[Russki]

Hi there
I live abroad, so don't get the usual UK brands of formula. Main one available here is Similac, and I was wondering if i should be using No 1 or No 2 for a nearly 4 month old baby. In the UK, i used Cow and Gate for Hungrier Babies (equivalent to number 2?) but the Similac pack seems to say that number two is only for six months on. Anyone have any ideas which I should be using (for a baby that wakes once in the night)?
Thanks

Forgot to add that i mainly breastfeed, but sometimes give formula for dreamfeed (although at the moment my baby seems to be rejecting the bottle after weeks with no problems)

No 1 if the other says from 6 months it's a "follow on milk" equivalent, not one designed as baby's sole source of nutrition