The phrase "normal part of development" means that it is a common and expected occurrence during the growth and progress of a person or thing. Full definition
These are lessons we all learned in life as a normal part of development. (empoweringparents.com)
If you feel this way, it can help to remind yo urself that this is a normal part of their development. (lansinoh.com)
These movements are a normal part of their development, and they gradually disappear as babies mature, usually by the time they are 3 to 6 months old. (kidshealth.org)