if i was you i would pick my battles wisely . one with your mother in law is never a good thing. why do you care what she says. let her say what ever she wants. let it go in one ear and out the other. its your baby so you have all say so when it comes to the baby. im 52, the mom of 6 and grandmom of 10. i too have given unwanted advise im sure more times the my children would like. we did do things different in our day. im sure your mother in law means no harm or insult. next time just say oh you might be right ill think about it and maybe ill try it. your baby is going to need her grand mother and you do not want to start a family feud out of the little things. i repeat...... pick your battles. btw my babies was eating solid foods mashed potato, green beans, sweet potato, bananas, carrots,all mashed of course sense they was 3 months old and was on whole milk by 5 months. im not telling you i agree with your mother in law im just saying i understand where shes coming from.