Doctor Betti Dr. Betti Hertzberg Ressler is a Board Certified Pediatrician on staff at Miami Children's Hospital. Dr. Hertzberg developed the toilet training video "Let's Go Potty." She is the co-author of "The Doctor's Book of Home Remedies for Children." Development Question: I have a 1-year-old son and he sits but he doesn't talk he only says mama and his sister's name. My daughter was 1 when she walked and 1 1/2 when she was saying a lot more words. He does stand on his own for a couple of seconds but he does not crawl he pulls himself and he rolls to where he wants to go. But on his walker he practically runs on it. So should I worry Dr. please let me know? Answer: Every child is different in their development. Although we are reminded not to compare one child with another, we can't help but do so. Especially our own. Motor and verbal skills do not follow any set rules. Each child will develop according to his or her ability. Gender (male/female), temperament, illness, and environment are just a few. Birth order also has a strong influence. First born children (not always) seem to be slightly ahead of their siblings in certain areas (no siblings competing for attention). Average ages for walking is anywhere from about 8 months to 15 or 16 months. That's a wide range! Anything much less or more than that should be looked into. Also, if walking has been attained and the child reverts back to "not walking," it also needs to be checked on. This basically goes for all major milestones. Unlike motor skills, communication (speech) depends on more senses to develop properly. Good hearing is important for speech development, especially in the first three years of life. Frequent ear infections during this time can sometimes delay speech. Two to three CLEAR words is perfectly normal for a 12-month-old child. By the time he is 2 years old, his vocabulary is much larger. He will be putting two words together. By three years, short sentences which are clear. Remember that ALL CHILDREN ARE NOT CREATED EQUAL. Check with your pediatrician about any concerns you have. Keep those well baby checkups. These visits are great for asking questions about the growth and development of your child. Anticipation of upcoming events in your child's life are also discussed. Enjoy watching your children grow! Dr. Betti Also see: How do you treat warts on the bottom of the feet? Is it normal for children to stick items up their nose? Ask Dr. Betti your questions This information is not intended to be a substitute for visiting your pediatrician. If you or your child has specific concerns, you should see your doctor for a diagnosis and treatment.