Nicolas Grimaldi on Instagram: "By around 4 months, most babies should have enough back muscle strength to roll from back to tummy 👶 Like any movement, rolling requires the body’s structures to be perfectly balanced and free of restrictions. In babies, these movements can be disrupted by a traumatic birth or a planned C-section. During the first 4 months, muscle development is focused on the back muscles i.e. the posterior chain. Every function in this stage supports that goal: ↪ Birth process: