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Denver’s are back on the bottle.

The unnamed brothers, who were born at The Denver Zoo on Aug. 27, have been getting supplemental bottle feedings after a routine weighing revealed they were a little lighter than veterinarians expected.

It turns out their mom, Faith, stopped producing milk, so the staff stepped in to provide supportive fluids, treatments and now, the feedings. The dip in weight was discovered on the morning of Sept. 28, when the cubs were just a day over a month old.

“A Denver Zoo veterinarian … monitored the situation throughout the weekend, but wanted to give Faith every opportunity to care for her offspring herself,” zoo officials said in a statement. “By聽Sunday, however, the veterinarian determined that the brothers had each lost enough weight to require bottle feedings, and began a regimen of five feeds per day.”

Fortunately, zoo officials reported, the cubs are doing just fine again after only a few days of bottle feedings.

The feedings will allow the cubs to gain around two to three percent of their body weight daily, according to the zoo.聽Veterinarians have been closely watched the cubs all along, regularly checking their weight, temperature and overall wellness, the zoo said, following supplemental feedings they received in their first days of life.

Poor milk production has been documented with other red panda mothers, the zoo said, and Faith also had difficulty feeding her last litter, Lali and Masu, .

These new cubs will likely require supplemental feeds for another three months before they are weaned, and it will still be another few weeks before the cubs are visible to the public and media. For now, they are still “developing behind the scenes” at the Zoo鈥檚 Feline Building, which is closed to the public.