K.E.
M.,
I know as a first time mom it's easy to worry about all kinds of things, but you can relax on this issue.
Nothing is wrong with your milk quality. It is perfectly normal for a breastfed baby that young to only go 3 to 4 hours between feedings. Breastmilk is easily digested and moves through their little systems very quickly. If it helps put your mind at ease any, my son did the same thing until he was about 6 and a half months old and we had started to introduce solids.
Also, don't fret about how much cream in your milk. The milk you produce is comprised of exactly what your baby needs. Your body will produce less cream during the day and more in the evening naturally.
Try to relax and enjoy the time you have with your baby at this age. It goes by all too quickly to be worrying about the small stuff! :)