Whether pre term babies achieve milestones ( rollover , crawling , walking etc) like full term babies and when to start solids for the baby who was born on pre term

A. In some cases they reach on time some kids reach before time and in most of the case you can say about 60 to 70% there can be a delay of a month or two in reaching the milestone but all these things are normal for kids and six months complete is the right age for you to start with food