May I pray Fajr after sunrise if I miss it due to my baby?

Assalamu alaikum, I need advice based on authentic sources. I have a nursing daughter who feeds a lot at night, and often she’s feeding right at Fajr time. If I get up, she cries terribly. I'm also very exhausted during the day, and my eyes just won’t open at that moment. I use my phone at night to help me feel better, but it messes up my schedule-without it, my mood doesn’t improve. Usually, I pray Fajr when I wake up around 7 or 8 am. Is this allowed, or is it considered a bid‘ah?