Mom is the one who spends most of their time with baby, so it is very important for young moms to change out of the sweats and forget about their outfit.
But generally, when they look good that makes them feel good. It is better to prefer the stylish dressing style than the frumpy one.
As a mom you should remember that you are going to be the one who teaches everything to your children in this case, they also learn about how to dress-up from you.