We have another baby due just before DD turns 2. Would like to use a cot with them from the start as we did with DD (so no crib). Ideally we would like to use the cot we have and move DD into a bed but is this too young? What signs should I be looking for that she would be ok (or not) in a bed. Don't want her to feel that new baby is stealing her cot hence the timeframe of around 21 months (she's currently 18 months so just thinking ahead a bit).