No high chairs, ever.
When your sims gets time, stock the fridge with meals that you can drag out at a moments notice
Making them all independent means you don't need an adult to start potty training
Leave toys out every where
Have them interact with each other often
Forget changing outfits, just give them cute night time clothes and live with it!
My sim couple (one half being Johnny Zest!) have just had twins and an alien baby (within hours of each other), so that house is a tad lively and this is only way my sims (and me!) can cope!
