Baby Bedroom What Age To Put Baby Into Bedroom With Sister?

What age to put baby into bedroom with sister? - baby bedroom

Baby is 20 weeks, currently in a crib in our room. Her sister is 3 and a little bit and we put the baby to her sister - but what age is "safe"? I worry that I spend the morning and my oldest daughter had all her teddy bears in the crib on her sisters face !!!!!!!!!!!!!!!!!!! Equivalent! Suggestions ?????