my daughter rolled over at 5 months...holded head at 6 months...sat independently at 7.5 months..started crawling at 11months...started pulling herself up in standing position at 12.5 months...n started cruising at 13 months...now she is almost 15 months old n can walk n stand with support very properly n confidently...but still not standing and walking independently...should I be worried or wait for a month to see her stand n walk without support???