The newborn infant who once stayed put is suddenly the toddler always going somewhere. This change is a natural result of your child's large motor development. It's important to understand how each new large motor skill comes about so you can encourage your child's progress. Development of large motor skills Children differ in large motor skills development.
Development occurs in stages with each building on the previous ones.
The fact that children progress through the stages in sequence and continue to progress is what's important, not the timing. The large motor skills described below are given with the typical age of achievement. Birth to 12 months During the first year of life, a baby learns many skills necessary for walking. Anytime from two to four weeks, babies lift their chins when placed on their stomachs. A short time later, at five to six weeks, they're able to lift their chests and at eight weeks control increases so that babies can lift their chests well above the surface.