Babies spend their first five months or so on their belly and back, working on strengthening different muscle groups to prepare for important milestones such as sitting, crawling, and eventually walking. Then around 6 months, everything changes! All of your baby’s hard work has paid off. Your baby’s neck control is better and her trunk is more stable. She’s able to play on her tummy while using her arms to interact with objects. Soon, she’ll learn how to sit upright, first with help, and…