I remember that it says upt to 2 on the cartons but is there a reason why they shouldn't have it? My ds has only had it since 1 when we have been away in hotels/b&bs with no fridge. We have a few nights in a pub b&b so wanted to get some cartons just for the mornings as he an early riser, and in the vague hope he may go to bed early and we can use the baby monitoring service last time we tried this (on our wedding night!) he screamed so much he was sick, very romantic.