What are the pros and cons for child's development if their mums are working vs sahm?

In my opinion, the development of your baby depends to whose take care of your child? When you are working, there is huge possiblity your nanny or your parents give your kid something you prohibitted such as candy, chocolate etc. When it happens all the time, your baby will refuse the veggies and other healthy menu. In long term of course it affect their development. If you are stay at home mum, you might control your kids meal. But if you have no helper, you might get exhausted and sometimes being too emotional when your kid get tantrum.