is this normal

Tia

when my daughter was around 5 Mo the she didn't sleep all the way through and still doesnt she is two and usually Wales up at 4 and come into my bed and sleeps for further two hours its so frustrating. I have a five month old son now and he goes to bed between 6-7 after he's bottles and will sleep to 5-6 in the morning then back to sleep at 8-9 is that normal for him to get so much sleep and not wake up for feed? My daughter was the opposite :( I'm just worried he is getting to much sleep