First time mom here so I’m clueless as to when its okay to buy my daughter this. She’s about to be 4 months feb 12 and when it comes down to play time or just when she’s awake she hates laying down or being laid back alittle. She wants to be sitting down I know some people say sitting your baby hurts her back, but at time she screams and cries and yes she tend to push herself up because she wants to sit down so bad. i was thinking of buying her a jumper? Or any recommendations? The second activity walker has a walker,rocker bouncer.