Hi, I'm just about to start using the doubles kit in its two-seater form (rather than seat + baby rack). I know the instructions say the older child should go in the front, but I'd prefer to have my 5mo in the front. Since my 2yo toddler will be in and out of the buggy, it makes more sense for him to be in the back. Do any of you put the older child in the back? If so, have you had any problems? Thanks.