Final answer:
Children around age 2 begin to assist in dressing and may be able to use zippers and Velcro, while buttons might still be challenging due to their fine motor requirements. By age 3, they are more adept at dressing themselves and can handle simpler buttons.
Step-by-step explanation:
Babies develop at their own pace, but there are general milestones they reach as they grow. When considering when babies can start to use zippers and Velcro, dress themselves, and struggle with buttons, we can look at their developmental stages. At 6 months, infants are gaining the ability to pick up objects and might start to show signs of understanding depth and color. At 1 year old, they may begin to cooperate with dressing and start mimicking simple actions. By age 2, children often start to express a desire for autonomy, showing preferences for clothing and may assist in dressing and undressing, suggesting they might handle zippers and Velcro, although buttons may still present a challenge due to their required fine motor skills. By age 3, their fine motor skills have improved sufficiently to where they may dress themselves with more precision and start to manage simple buttons, though they might still need assistance.