Is it ok for my 2 month old baby to sleep less than 15 hours? She slept through the night since midnight and woke up once or twice for dream feed, then stay awake till noon and slept for 2.5 hours only. Thereafter she is awake till now. I'm worried she is over stimulated and become fussy later. How do you put your baby to sleep?

Younger babies tend to not sleep by themselves. You have to help them to sleep by rocking, patting or hugging them. It will be better to help them to sleep than to let them stay awake for too long. By the time they are overly tired, they will be fussing a lot and it will be harder to let them sleep then. When my baby is at that age, he requires a lot of touch from me so I hugged him to sleep. I got myself into a comfortable position and let him sleep on me. Be careful not to fall asleep! It will risk flattening them.

It's totally okay. The average is literally that, an average. There will be some babies who sleep more and others who sleep less. When my LO was 2 months, he was sleeping even less than yours. Just make sure that you establish a proper bed time routine and she's in bed from about 7 or 8 pm at night. It's completely fine for her to be awake for most of the day.