"Before good cutting utensils" may be going very far back in time indeed: do consider x-posting to r/AskAnthropology. Meanwhile, not discouraging discussion here, but there have been a few related posts in this sub that can get you started

• Did our ancestors clamp and cut and tie the umbilicus (navel) like we do? If so, always? If not, when and how did it begin?

• When was the earliest documented "cutting of the umbilical cord" and what did people do before then

• How did people's belly buttons look in the past?

If you have follow-up questions on archived posts, just ask them here; to notify the relevant user, mention their username.