

Previously, when I played said lazy sim and didn't watch what he ate, he had a steady diet of pancakes, BLTs, eggs and toast, and macaroni and cheese, with the occasional cake or pizza, and he was at about 75-80% on the weight slider around his adult birthday. Because lazy sims get a bad moodlet after exercising, I didn't have him do any of it. I had a lazy sim start off at about 25-30% up the weight slider as YA, and even eating half his meals as salad or yogurt, he was at slightly over mid-range when I later put him into CAS after turning adult. In your active household, even eating two meals a day, especially if they are not salad or a yogurt from quick meals, your sim will gain weight over time if he or she doesn't also exercise. I suspect the game reads pregnancy as the sim being overweight, and then there is a high chance the offspring will inherit that inflated weight.

If you're seeing it in children, I've noticed when I put families into CAS through full edit mode while managing households I'm not controlling, that almost all children, even if both parents are still thin, are born about 2/3 to 3/4 of the way up the weight slider.
