Explain the condition called infant developmental delay.?

It refers to any: Condition (there are very many) that causes a child to mature, physically or mentally, at a slower rate than most other babies. There are growth delays, speech delays, cognitive (thinking) delays, gross motor (walking etc.) and fine motor (picking up small objects, etc.) delays.

Lags: There is a range of ages in months during which typically-developing infants attain a particular milestone in a developmental stream, e.g., communication, social-adaptive, motor.When an infant has not attained a milestone achieved by 90% of infants at a given age, he has a developmental delay. Depending on neurological findings, baby may be monitored for 1-2 mos. Or therapy may be instituted.