What's the worst advice or myth you've ever heard about breastfeeding?

"Breastmilk is not good for baby coz they r not as chubby as formula fed babies" Commonly from the old folks coz most of them do not have education and information on the benefits of breastmilk. They believe chubby=healthy only, It takes time for them to realise the real importance and benefits of breastmilk. They just simply like chubby babies.