What are the milestones in Kid's development (phase-wise like 1st 6 months, 6 to 12 months, 12 to 18 months & onwards) to be achieved during first 3 years?

A. Hello there ma’am please do not worry about it too much and most of the babies start sitting till the age of 6-7 months and also start crawling till nine months and start walking between 10-15 months and also start speaking few words up to eighteen months. And start speaking properly up to three years of age and also you can check on google with all details. Take w