I've recently been told that it is not healthy to keep your baby in its car seat longer than 90 minutes. Is this true? Is this applicable to the baby seats (bouncers) with hard supporting backs? Is there a time limit on these as well? My dd2 doesn't like being in her pram any longer because she's become naturally nosey so its a lot easier to put her into her chair where she very contentedly looks around before drifting off to sleep. On the basis of never waking a sleeping baby I'm loathe to move her