Moms, whose children don't sleep?

Moms, whose children don't sleep?! My daughter is 40 days old and basically doesn't sleep during the day at all.... ? I also have a 2-year-old son, he's very noisy — do you think she doesn't sleep because of him?! How is it for you?! She makes some noises and wants to be held, but I wouldn't say anything's bothering her, she doesn't cry, seems fine.