3 doctors weighed in:

What kind of condition is developmental delay of gross motor movements?

3 doctors weighed in
Dr. Mark Diamond
Pediatrics
2 doctors agree

In brief: Problematic Maybe

Studies have shown that most kids follow a pattern of advancing skills regarding use of various muscles.
There is a tremendous range of time, so a child may walk as early as 7-8 mos and as late as 18-20 mos and still be in the "normal" range. When these advancements are delayed, longer than the expected latest normal time, we worry about problems.

In brief: Problematic Maybe

Studies have shown that most kids follow a pattern of advancing skills regarding use of various muscles.
There is a tremendous range of time, so a child may walk as early as 7-8 mos and as late as 18-20 mos and still be in the "normal" range. When these advancements are delayed, longer than the expected latest normal time, we worry about problems.
Dr. Mark Diamond
Dr. Mark Diamond
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