My wife is 6 to 7 months pregnant and why is not the baby moving about in her stomuck?

20 weeks . Most women will begin to feel the baby move around the 20th week. She will need to see a doctor to confirm how far along she is and to make sure everything is ok.
See doc. At 24-28 weeks at least 10 movements per day should be felt. It may be discreet and she may have to slow down to feel them. If she feels nothing when lying down and concentrating on it, it's time 2 go in. Good luck.