Hi,
My daughter is also 3 months, and bf.
I have been expressing daytime to give a night feed so i know she is getting it b4 bed time, she goes to sleep with feed at about 9 then up at about 1 and again 4 and so on.
Last night i did not give her expressed i just fed her and she settled much quicker, and went through til 4, so expressing seems a bit of a waste, i am now going to freeze what i express to do her baby rice and porridge with when i wean her.
As long as your dd is happy and gaining weight ok then i would not worry, my dd feeds as and when, it really is on demand, i dont count her feeds or for how long she feeds, if she crys i offer her boob and weighing in today at 12lb 7oz she is doing just fine.
My last dd slept through the night from birth, and was throughly content on breast milk, if a baby is hungry they will soon let you know!
Take care
Pinky xx