You can check your child's growth against the growth chart in the health booklet. Don't worry about the actual number but look at the trend instead. If the child's weight and height are on a consistent line and not on a downward trend it should be fine. Anyway it's expected for their growth rate to slow down after the first year.
your child’s growth may slow down a bit after 12 months . Delayed growth are completely normal for some reasons . But there can be other health issue also. There for if you have any concerns about your toddler’s growth, you should always speak to a doctor for further evaluation.