Question
Newborns often keep their thumbs inside their fists during the postpartum period. At two and a half months old, they occasionally still place their thumbs under their index fingers. Sometimes when their palms are open, the thumb sticks to the index finger, and sometimes it is spread wide. When sleeping, the thumb does not bunch up, and there is no internal or external rotation of the arms, but when they hold their heads up, there is some trembling.
Answer
Within the first year of life, infants’ motor development mainly manifests in the progress of hand movements and upright walking movements. Specifically, from lifting their heads to rolling over (at 3 months), sitting up (at 6 months), crawling (at 8-9 months), standing (at 1 year), and then learning to walk (at 1 year and 1-2 months). Hand movements also gradually form eye-hand coordination movements, from unconscious stroking (at 3 months) to random stroking (at 5 months) to the development of grasping movements after 6 months. Guidance: