self-soothe          
verb [ I ] uk/ˌselfˈsuːð/ us/ˌselfˈsuːð/
 (婴儿)自我舒缓
(of a baby) to stop crying and become calm without help from an adult
  Encouraging your baby either to suck their thumb, finger or use a dummy is a great way for them to learn to self-soothe. 鼓励宝宝吸吮拇指、手指或橡皮奶头,是让宝宝学会自我舒缓的好方法。 
  自我安慰,自我安抚
to make yourself calm or happy
  She eventually learned some other tools to self-soothe without food. 她最终学会用其他一些办法自我安慰,而不是食物。 
 - More examples
 - She must learn to self-soothe when she wakes in the middle of the night.
 - Babies who can't self-soothe grow into preschoolers who won't sleep unless there's a cuddly parent in their bed.
 - Learn to self-soothe and to be comfortable alone.
 - bad self-soothing habits like chocolate binges