Its about the size of a jelly bean and weighs less than a gram. 갓 태어난 조이는 앞다리를 이용해 엄마의 주머니로 기어 올라갑니다. There, it hangs on an elongated nipple, which inflates and pierces the babys throat and holds it in place for about three and a half to four months, Schwartz said.