The Jill and Jessa: Counting On star relies especially on her big sister Jill (Duggar) Dillard and mom Michelle Duggar for advice on parenting baby Spurgeon Elliot, her 4-month-old son with husband Ben Seewald.
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"She has raised just about every personality type, so I really enjoy learning from her," Jessa, 23, tells PEOPLE in this week's issue.
"But my baby is really still young, so most of my questions these days are about breastfeeding and when to change diaper sizes," she adds.
For more on the Duggars' lives these days, pick up this week's issue of PEOPLE, on newsstands Friday
"I have the opportunity to video-chat with her," says Jessa of Jill, who has an 11-month old son, Israel David, with her husband Derick Dillard, 26. "[We] catch up and talk about how Israel is progressing and [I'll] ask her a question about having a little baby. She is a really great resource for me."
RELATED VIDEO: Jessa (Duggar) Seewald Opens Up About Difficult Home Birth and Why She Was Rushed to the Hospital
Jessa and Ben, 20, welcomed Spurgeon (nicknamed Quincy) on Nov. 5 after an intense, 48-hour delivery.
"I can't believe he's really ours," Jessa told PEOPLE exclusively at the time. "It is so amazing. He's a miracle."
In the months since, the proud parents have shared several adorable updates of their smiley son, including a sweet slideshow of his first Christmas.
Their experience as proud, happy new parents will continued to be documented when Jill and Jessa: Counting On returns March 15 at 9 p.m. ET on TLC.