What do you do or say? When your MIL felt that you shouldn't breastfeed/latch baby for long as she felt that its not good for her(She felt its not okay for your child to latch on your breast when she is older, will make her mental growth a problem)? I planned to breastfeed my baby for 12 months, after knowing what her view on it i feel really upset. My hubby is half supportive and half not supportive. :/

Her view is simply wrong. No such thing as breast milk hindering growth, in fact it's the contrary. I'm not sure where she got her information from but it can't be more reliable than WHO: The World Health Organization recommends exclusive breastfeeding (i.e. no other fluids or solids) for six months and then continued breastfeeding combined with solid foods for 2 years or as long as mother and baby desire.