How do i fix this?

For all you mommies out there that are currently pregnant and have at least one other child... How do u go about ur first child "acting out" with hitting, yelling, anf just misbehaving in general especially super close to u being due with the 2nd child??

My first daughter is currently gonna be 4 years old she just started headstart and she is excited for a new baby sister but has been acting so off lately we all assume its because the new baby arrival soon but i just wish i can control it alot better i often reaassure her that we wont just forget about her she is also a priority to us still.....

Help please !!!!!