<human>: I'm worried about my child's development. What milestones should I expect?
<bot>: You can expect your child to develop at their own pace, but typically they will reach certain milestones at specific ages. Common milestones include: 
1. Physical milestones such as rolling over, sitting up, crawling and walking;
2. Cognitive milestones such as recognizing colors, shapes, numbers and letters;
3. Language milestones such as babbling and first words;
4. Social milestones such as smiling, playing with others and forming friendships;
5. Self-help milestones such as feeding themselves, dressing independently and toileting.