First of all a three month old doesn't "act up" something was obviously wrong. shopping is hard on babies and children and occaisionally if I am in the mall more than half an hour I freak out. :LOL Sometimes it is better to j ust give it up for the itme being. maybe grab an iced tea and sit in th cafe until he settles down. falls alseep, just somewhere wheree y ou can both relax a little. If you are worried and stressed about what other people think just head for the car and relax. Most stores if you tell them you need to leave and take care of your baby will watch your cart.
You need to learn how to handle this now because when they are two they will act up and intentionally try to get out of shopping and that is normal and developmentally appropriate and there is no reason to run yourself ragged trying to stop it. They know. They wil just work harder to dlip you out.
Thirdly, some ol;d ladies will look and judge but most people will be thinking one of two things when they see your child screasming a)they will be silently opffering up prayers of thanksgiving that for just once there is someone to distract people from thier child
b) they will be remembering when thier children were that age and how quickly those precious precious years fly by. c) some may be desperately wishing they had a baby even if it was throwing a royal fit. and hey! if you are really lucky someone will ask you if there is anything they can do to help. I know it sorta feels like they are judging you but take it for the sincere offer it is. I know if someones kids was hungry and tired and I had some crackers that would make it better I owuld offer them to the mom. or if someone could push my cart over to the side of the store while I carried the baby I would be more thanhappy to let them. usually people really do want to just help. they have euither been there, are there or will be there and they know it.
And finally, if you think your are bad, while pulling dd out of clothing racks and wresteling her back into the stroller while trying to hold my newborn she would scream "Help, she is hurting me, I don't know her and she is hurting me. where is my mommy!!!" where to 3 year olds get this stuff?