I have a two year old and I am expecting in Dec. By then, my daughter will be 2 and 7 months. I have a Phil and Ted Dot which I am very happy with. Thinking of getting the extra seat to make it into a double buggy. However, the seat looks quite small and my daughter would need to sit in it until baby 2 is big enough (he/she will need to lie flat in the main seat at first). The only thing is, the extra seat looks sort of small. Has anyone used it before and how old can your child be to still fit in it comfortably? My daughter is a little tall for her age - not massively or anything! Any advice happily received!