Abdominal muscle soreness

Breanna • I'm a stay at home mom. I have a 2 year old son and now we are on baby #2 (a girl!!) due in April! 😊
Any other Second or more time moms experiencing abdominal muscle pain. I talked to my doctor and she told me she thinks my abdomen is weakening. I know my abdomen muscles didn't fully recover after my first pregnancy but it's really hard lifting up my 30 pound son on a daily basis. Anyone else experiencing this pain? And have anything that helps?