I had to change over from the basinette to the seat when my daughter was around 5 months old as she was too long to lay down comfortably. Personally even though I only used the basinette for a short period of time, I would still recommend it, as it was a lot easier to keep bubs warm and it was a perfect little bed for her to sleep in when we were out. The seat can't fully recline back and it isn't recommended for bubs under 6 months anyways.