Children grow and develop at different rates, though there are general developmental milestones that most children will follow. When they do not meet those milestones, it can raise some concern as to what is causing it. Here are some notes from the experts at the American Academy of Pediatrics on what to look out for:
Some children with speech delay will experience it only temporarily, while others may need professional assistance. If you have any concerns that your child might have a speech delay, schedule a visit with your pediatrician to discuss it. Feel free to check out this link from the American Academy of Pediatrics:
https://www.healthychildren.org/English/ages_stages/toddler/Pages/Language-Delay.aspx