Baby Josie Duggar -- who was born at just 25 weeks -- is slowly gaining strength, as a clip from Tuesday night's 19 Kids and Counting shows. (Watch above.)

"It's just very difficult seeing her struggle for life like this," a wistful Michelle, 43, says of her 19th child, who weighed just 1 lb., 6 oz. at birth. "I haven't really gotten to hold her yet. I'm really looking forward to the day I get to pick her up."