Josh Duggar, 23 – the eldest son of Jim Bob and Michelle – and his wife Anna, 22, are expecting their second child on June 19 to join older sister Mackynzie, 17 months.
The couple chose an unconventional method for learning the gender of the child – they had Michelle tell them.
"We went to the ultrasound and decided that my mom would know," Josh tells PEOPLE. "We figured she could handle the secret and then have a surprise sharing of the information with the entire family, including me and Anna."
They waited more than a week, and it wasn't easy. "I think Anna was getting a little bit anxious and excited to know, kind of antsy," says Josh. Anna agrees: "We thought it was fun to have the whole family hear at the same time and have the excitement together, but it was hard to wait."
Josh and Anna are now happily planning a home birth and thinking about boys' names. Mackynzie had an unplanned home birth, but "it went so well," says Anna, "that we are glad to be preparing for a home birth this time."
All 19 children born to Michelle, 43 and Jim Bob, 44 – 10 boys and nine girls – have names beginning with a "J," so the inevitable question is: Will Josh and Anna follow with an "M" tradition for their children?
"We still have a little time left to decide," says Josh. "Anna and I will find a good name that will be perfect for this little boy."
Meanwhile, Anna says her pregnancy is going well and she feels good.
"Our No. 1 tradition is having Josh read the bible to the baby," she says. "And we tell the baby, 'We love you and we can't wait to meet you.' We are explaining to Mackynzie about having a new baby in the house. I don't know if she knows the difference between a belly button and a baby, but she is learning."
Josh says the health scare that his youngest sister Josie survived after being born at only 25 weeks – she is now thriving as a 15-month-old – is making him grateful for Anna's healthy pregnancy.
"Anna is at 26 weeks into the pregnancy now," he says. "I think of Josie being born at only 25 weeks, and it makes us think about how precious life is and what a blessing each child is."
All the Duggars discover the gender together on Monday's episode of TLC's 19 Kids and Counting, airing at 10 p.m. ET. (Watch a clip below.)