The Oregon Zoo has an adorable new baby: The long wait is over. After more than 20 months of pregnancy, Rose-Tu, a 30-year-old Asian elephant at the Oregon Zoo, gave birth at 4:29 p.m. Saturday afternoon. Staff are keeping their distance to give the pair time to bond, but the calf appears to be a healthy, strong female, weighing in the vicinity of 200 pounds. “We couldn’t be happier with how everything is going so far,” said Steve Lefave, who oversees the zoo’s elephant program. “This was one of the smoothest births I’ve ever seen. Rose knew just what to do. She helped her baby up right away. The kid was standing on her own within 15 minutes and took her first steps soon after that.” Zoo staff had been on baby watch since Jan. 29, when Rose-Tu’s progesterone levels dropped to near zero, indicating labor should begin soon. Rose experienced early labor throughout the day on Feb. 1 and began showing signs of active labor a little after 3 p.m. Veterinary staff have yet to conduct their first check-up, but once Rose and her calf are ready, they’ll weigh the baby and confirm its sex. Based on their observations so far though, everything is going very well. “Rose is a fantastic mom,” Lefave said. “She’s so gentle and protective, and the calf is already nursing well. These are signs that they will have a strong bond, which is exactly what we want to see. We’re ready to help if…