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during teething
teething 作名词时指婴儿长牙的过程，常与 during 连用，表示“出牙期间”。
Some babies become restless during teething.
有些宝宝出牙期间会变得烦躁。
出牙；长牙
先理解核心含义，再看它在真实句子里的用法。
出牙；长牙
the eruption of a baby's first teeth through the gums
Some babies become restless during teething.
有些宝宝出牙期间会变得烦躁。
出牙:乳牙从牙龈萌出的过程；长牙。
The eruption, through the gums, of the milk teeth; dentition.
Teething usually begins when babies are about six months old.
出牙通常在宝宝大约六个月大的时候开始。
Parents often look for signs of teething, like redness in the gums.
父母常常寻找出牙的迹象，比如牙龈发红。
The baby's teething has been more difficult than her brother's was.
这个宝宝的出牙过程比她哥哥当时更艰难。
teething 作名词时指婴儿长牙的过程，常与 during 连用，表示“出牙期间”。
Some babies become restless during teething.
有些宝宝出牙期间会变得烦躁。
teething 可放在名词前作定语，构成复合名词，如 teething ring（磨牙环）、teething gel（出牙凝胶）。
The baby is chewing on a teething ring.
宝宝正在咬一个磨牙环。
Not this
The teething can make babies fussy.
Use this
Teething can make babies fussy.
teething 在此泛指“出牙”这一不可数过程，属于抽象名词，表达一般情况时前面不加 the；中文没有冠词，容易误加 the。
Not this
At teething, babies often put things in their mouths.
Use this
During teething, babies often put things in their mouths.
teething 表示一个持续的过程，表达“在出牙期间”要用 during teething；at 多用于时间点或具体时刻，不用于这种过程名词前。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
磨牙环
The baby chews on a teething ring to soothe her gums.
宝宝咬着磨牙环来缓解牙龈不适。
出牙凝胶
Apply a little teething gel to your baby's gums.
给宝宝牙龈抹一点出牙凝胶。
出牙期疼痛
Teething pains often make babies fussy at night.
出牙期疼痛常常让宝宝夜里烦躁不安。
出牙期
During the teething period, the baby may drool more than usual.
出牙期宝宝可能会比平时流更多口水。
出牙症状
Swollen gums are a common teething symptom.
牙龈肿胀是常见的出牙症状。
出牙期的宝宝
A teething baby often wants to bite on something hard.
出牙期的宝宝常常想咬硬的东西。
初始阶段遇到的困难
The new software is having a few teething troubles.
这个新软件还有一些初期问题。
起步期的阵痛
Every new business suffers teething pains at first.
每家新企业在开始时都会经历起步期的阵痛。
Use teething naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
teething像teeth（牙齿）加-ing：小牙正在往外冒，就是出牙期。
语域：neutral 常见场景：儿科门诊、育儿书籍、家庭日常对话 teething 是中性常用词，通常用于医学、育儿或家人谈论婴儿出牙的场合；日常口语和书面说明中都比较常见，没有明显的正式或俚俗色彩。
真正押韵的词有 seething /ˈsiːðɪŋ/、breathing /ˈbriːðɪŋ/、sheathing /ˈʃiːðɪŋ/、wreathing /ˈriːðɪŋ/、bequeathing /bɪˈkwiːðɪŋ/。注意 clothing /ˈkloʊðɪŋ/ 拼写相似，但元音是 /oʊ/，并不押韵；另外 teeth 的结尾是 /θ/，而 teething 中是 /ð/。
Dictionary facts from ECDICT, WIKTIONARY.