How much sleep do babies need?

Claire is up to her tricks again last night!

She woke up at 12.30am, 2.30am and 5.30am. I am a panda today and nursing a bad headache!

I seriously wonder how much sleep babies need? Based on the guideline, between 3 - 6 months old, she should be sleeping a total of 12-15 hours.

This little rascal dun seem to be sleeping that much. Sigh, i just pray for the day that she can sleep through the night without waking up!