The following guideline may give you some ideas on taking care of this problem.
Some children have one or more small BMs a day, but never empty their intestine.
Technically, they could be considered constipated. It may be more difficult to recognize this as a problem, but it may be a problem for the child because it may cause a stomach ache. In newborns, it would be defined as the passage of hard stools. This is NOT considered constipation. Newborns also typically strain or even cry during BMs, which is also not considered an indication of constipation.