we have a bike seat and have recently bought a trailer as DD1's legs are a bit too long for the bike seat now.
we also have DD2, who is 18months. It says on the trailer that it shouldn't be used before 18 months (as opposed to 12 months for the bike seat), but i am a bit precious about DD2. She's still in a backwards-facing carseat because she has a big head (same size as DD1's if not bigger...) and because we can still get away with it.
so what are the issues with trailers for those younger than 18 months? do you have any advice and/or experience? please share!