At night babies at this age are supposed to have 12 hours sleep, so the amount isn't too much. The sleeping through is fine too, you don't need to wake him
That’s absolutely normal, you’re lucky!
Don't worry, my little girl has been doing 10-12hrs during the night since 2 weeks old. She's okay - just likes sleep
My little boy went to bed at 7.30pm Friday night and didn’t wake until 8.10am the next morning 😂 Make the most of it and enjoy the rest!
My boys 4 and a half months and sleeps 7-5/6am so I’d say it’s okay as long as like you say she’s healthy and gaining weight :)