A 穿破牙龈时 B
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12257562_0.gif">面露出时 C
对<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12257562_0_1.gif">牙也已经萌出时 D
牙萌出后达到<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12257562_0_2.gif">平面时 E
以上均可以