Try to eat MORE often, not less often, smaller snack-sized meals. Breakfast protien and fruit, morning snack, protien and veggies, lunch, protien, veg and carb( whole grain or potato/yam) , afternoon snack, protien and veg, supper, protien, veg, and carb, and then a bedtime snack of a little fruit.
Eating a little meal every 2-3 hours revs up your metabolism, and makes your body keep burning fat, rather than storing it, in case you don't get but one or two meals a day - "starvation mode" makes you store fat.
Walking is great! do it now while your baby will still lay in the stroller that long, my 3.5 year old and 1 year old won't stay in the stroller for more than about 20 min. so I can't get that amount of walking in.
Maybe Look into T-Tapp - it is an exercise routine with no equipment needed but your own body, and it pumps your lymph system inthe process to help rid the body of toxins and waste products. www.t-tapp.com She even has free exercises on You-tube for you to try before you buy.
Good Luck,
Jessie