THANK GOODNESS it's not #20 for Michelle and Jim Bob... but it is grandchild # 3! Their daughter in law Anna is expecting AGAIN... 3 baby in 3 years!! What is in their water??? 

 
Jim Bob and Michelle Duggar's oldest child, Josh, and his wife, Anna, tell PEOPLE they are expecting their third child. They are already parents to daughter Mackynzie, 3, and sonMichael, 21 months. 

"It is very exciting," says Josh, 25. "It's fun for Michael and Mackynzie being so close in age and this baby will be, too. We feel very blessed and happy." 

Anna, 24, had taken a pregnancy test when the family visited Asia for 19 Kids and Counting: Duggars Do Asia (premiering Tuesday at 9 p.m. ET on TLC), but it was negative. "I thought for sure I was pregnant and so I was a little disappointed," she says. "But two weeks later, I found out I was pregnant."