I have been involved with working out for about 5 years now. I had a baby 10mths ago and no matter what I do, eat, not eat, workout, cardio, no cardio, WHATEVER it is I am stuck at 195 pds

BUT I look as if I am about 160. I used to be a small fitness type very cut person but now, screw this I have decided to stay big but with progession. My question is this:
What do I need to do to stay very fit & musclar but yet look sexy? What should my diet be? My stats are as follows:
30 yrs. old
5'5"
195lbs
bi's 14"
waist 36"
bust 40"
butt 42"
quads 26"
calves 18"
Diet is:
Breakfast 1 rye/raisin muffin 1 slim fast
snack 4oz chicken, 1 c
brown rice or 1 c
fresh veggies or noddles
lunch 4oz fish/chicken, with same as above
snack sometimes nothing or wheat thins
dinner same as lunch
The only real problem areas are of course my abs and butt. I work out 5 days a week, lift heavy (very strong) but I am getting discouraged because you cant tell that I do workout and I want to be cut, fit but about 170lbs. Please any advice would be great. If you would like, I can send in some photos for progress. I want this and I know I can do this.