Congrats to you and your wife Michael! My teacher Tama, a yondan, had a child seven years ago at age 38. She continued to teach and train with above posted modifications until month 8. My wife April,a nidan, had our first last May at age 32. She tried a few classes after finding out the good news and felt she couldn't practise safely with what her body was going through. Unfamiliar to say the least! She returned to the dojo about three months after giving birth to Sasha, our son.
Hope it helps