Each of the girls made a gift for Shauna, with Taissa and Akilah making her a crib, Van gifting a "peepee teepee," and Lottie giving her a baby blanket with the mysterious symbol embroidered on it.

Source: https://screenrant.com/what-happens-to-shaunas-baby-in-yellowjackets/

Reports have already confirmed that Lauren Ambrose will be joining the series as the adult version of Van, with Simone Kessell as as a new character named Walter, Nicole Maines as Lisa, Francois Arnaud as Paul, and Nia Sondaya as teen Akilah.

Source: https://comicbook.com/tv-shows/news/yellowjackets-season-2-reviews-rotten-tomatoes/