Final answer:
The OTR® would expect the child to start crawling around six to ten months of age.
Step-by-step explanation:
Based on the provided information and typical developmental milestones, the OTR® would expect the child to start crawling around six to ten months of age.
At six months, infants are usually able to sit up with support and pick up objects, while at ten months, they are able to crawl and pull themselves up to a standing position while holding furniture or someone's hand.
However, it's important to remember that every child develops at their own pace, so these milestones can vary.