胎便是婴儿在母体内就已经形成的粪便。怀孕20周以上，在胎儿肠道中便存在有胎便，胎便是新生儿最早的肠道分泌产物，形态黏稠。 胎便85%～95%为混合着肠壁上皮细胞、胎毛、胎脂、胆汁黏液及所吞咽羊水中的部分固体成分。它的颜色为墨绿色，愈靠近预产期，胎便量就愈多。
泳疗在新生儿生长发育中的临床研究 关键词] 新生儿游泳；胎便；新生儿体重；新生儿神经行为 [gap=1253]Key words] Neonatal swimming; Meconium; Neonatal weight; Neonatal bathing
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它还有助于他通过他的首肠运动，这是所谓的胎便。
It also helps him pass his first bowel movement, which is called meconium.
此举目的是降低胎便吸入症候群的发生率和严重度。
The aim is to reduce the incidence and severity of meconium aspiration syndrome.
胎便正在她的肠内累积，这将成为她出生后第一次排出的物质。
Meconium is accumulating in her bowel and will become her first dirty diaper after birth.
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