After your second or third child, you may be ready for a little cosmetic intervention.   Most surgeons will prefer that you have stopped breastfeeding and lost most of your pregnancy weight before any surgery, at least six months.   Your body needs this period to adjust, and you also have to settle in to a new lifestyle and schedule before you subject your body to any more trauma.   You need to get stabilized.   The physiological changes that occur during pregnancy are mostly due to hormone levels; skin tags on he neck and chest, darkened moles, scars and freckles, melasma (increased pigmentation over the upper lip, cheeks and forehead), varicose veins and spiders on the legs, face and neck, bleeding gums, itching on the abdomen, skin eruptions or rashes, increased hair growth on the upper thighs and underarms.   Fortunately, many of these conditions resolve on their own, without treatment after the baby.   Of course some do not.