Baby slept 11 hours

Has anyone’s baby slept 11 hours at night?

I’m only suspicious because two nights ago our monitor turned off in the middle of the night and we didn’t hear her when she woke up. I was so sick about it when I woke up in the morning and realized what had happened. We switched monitors and it was on when I woke up at 7 today plus I left the iPad at max volume with the nest to her room on.

I’m just wondering if this is normal. She’s 3 months old. 14 weeks. My son is 2.5 and he never slept that long until he was much older.

She also took an almost 4-hour nap yesterday. Could something be wrong with her since she’s sleeping so much?