Jitters or trembling of the arms and legs during crying is normal in newborns. It should stop by 1 to 2 months of age.

When do babies stop jerky movements?

These reflexes are involuntary movements that are a normal part of infant development. These early reflexes gradually disappear as babies mature, usually by the time they are 3–6 months old.

Is it normal for babies to jerk?

Newborns have an immature nervous system. The pathways that carry the signals from the brain to the parts of the body aren't yet fully developed, so their movements can appear jerky and twitchy. The jerking and twitching will become less frequent after the first few weeks of life as the baby's nervous system matures.