my 4yr old baby girl is always disturbing my 2 months 21 days baby how to manage both of them

A. See when the younger one is sleeping spend more time with the older one it is either out of curiosity that your child wants to play with the younger one why the child is sleeping why not playing with me there’s so many questions so tell your child this one is sleeping less spend more time with each other because I have time for you because maybe the child is feeling a excluded which is why your child is behaving like this so try to maintain a balance between