What is the custom for celebrating baby 4th month?

My mum did the 4th month custom for both my boys. She will shave baby's hair so that they will not start falling to "change" new hair, let baby have a taste of chicken drumstick as an indication to start solids, poke 12 marnie biscuits on a red thread and hang on their neck and wipe their mouth so that it will minimise drooling and lastly let him sit in the walker. Not many parents are following this custom as they listen to western advices like walker shouldn't be introduced to babies, solids should start after 6 months etc. I find that it is up to personal preference as I feel that it is alright since we all grew up this way and my elder boy grew up fine so we just followed.