Can someone help me please. DD is 25 months old and DS is nearly 3 months. I've purchased the Phil and teds vibe and it's a great pushchair BUT I find the back wheels are too wide and keep crashing into things or getting stuck trying to get through a narrow isle. DS is also a big boy and the cocoon is starting to get a bit snug but his head is not yet strong enough to go in the 2nd seat. It is fantastic to push and feels so light although I am struggling with the fact it's a 3 wheeler. As much as I love it, getting to my point, I don't know whether to just get on with it and then change it at a later stage or would it be best to get a single pram and a buggy board. I don't tend to go out that often but when I do it's usually all day so DD does tend to get tired and fall asleep now and then. I don't know what to do so I would really appreciate your oppinions.