由于新生儿胆红素的代谢特点，约50%~60%的足月儿和80%的早产儿会出现生理性黄疸。足月儿在出生后2~3天出现黄疸，4~5天达到高 峰，5~7天可以消退，但一般不超过2周，而早产儿多于生后3~5天出现黄疸，5~7天达到高峰，7~9天可以消退，最长可延长到3~4周，每日血清胆红 素升高<85μmol/L(5mg/dl)，否则，则要考虑病理性黄疸的可能。
生后一周内，宝宝由于奶量摄入不足，加之水分丢失、胎粪排出，可出现暂时性体重下降或生理性体重下降，约在生后3~4天达最低点，下降范围为3 %~9%，以后逐渐回升，至出生后7~10日恢复到出生时的体重。如果下降体重超过10%或者至第10天还未恢复到出生时的体重时，则为病理状态，这是家 长需要带宝宝前往医院请专业的医师检查分析其原因。另外，出生后及时合理喂哺，可减轻或避免生理性体重下降的发生。
在口腔上腭中线和齿龈部位，有黄白色、米粒大小的小颗粒，即俗称的“马牙”，“马牙”是一种正常的生理现象，主要是由于上皮细胞堆积或粘液腺分 泌物积留形成，数周后可自然消退，家长切记不可用牙签挑破，以免发生感染。但少数初生婴儿在下切牙或其他部位有早熟牙，即医学上所称的新生儿齿或诞生牙， 这种早熟牙多数活动易脱落而致吸入呼吸道，因此，需要拔除。
有些男女新生儿出生后4~7天会出现乳腺增大如蚕豆或核桃大小，2~3周后可消退，切忌挤压，以免引起感染；部分女婴5~7天阴道流出少许血性 分泌物，如来月经般，或排出非脓性分泌物，可持续一周。上述两种情况都属于正常的生理现象，主要是由于来自母体的雌激素中断所致，家长可不必太过于焦虑担 心。
New parents with no experience, after the birth of your baby is always busy get panic feet, baby slightly anomaly is very nervous. Maternal and child health care physician reminder, in fact, some babies "abnormal" is a www.cdsycg.com special physiological phenomenon, parents can need not worry too much, such as jaundice, weight loss, horse teeth, breast swelling, false menstruation, erythema and millet, rash, and so on.
When baby is a bit unusual, parents are always very anxious, but the baby these
exceptions, some does not belong to the pathological state, but a normal physiological phenomenon, you understand? So, baby what are the common special physiological phenomena? Guangdong province maternity and child care Lin Huifang physicians now took everyone look at:
Due to the metabolic characteristics of neonatal bilirubin, about 50% ~ 60% of the full moon and 80% of the preterm infants www.jnhshr.com will be physiological jaundice. Full term in 2 ~ 3 days after the birth of jaundice, 4 ~ 5 days to reach the high peak, 5 to 7 days can fade, but generally not more than 2 weeks, more than 3 ~ 5 days after birth and
premature infants appear icteric, 5 ~ 7 days to peak, 7 ~ 9 days can fade, the longest can be extended to 3 ~ 4 weeks, the daily elevated serum cholesterol red element < 85 mu mol/L (5 mg/dl), otherwise, should consider the possibility of pathological jaundice. Physiological weight loss
Within one week after birth, the baby due to inadequate intake, milk production and water loss, meconium discharge, there will be a temporary weight loss or physical weight loss, about 3 ~ 4 days after the birth of low, decline range is 3% ~ 9%, and gradually recovered, to 7 ~ 10 days after the date of birth to birth weight. If the weight more than 10% drop in or to the 10th day hasn't been back to the birth weight, is the pathological state, it is a long need to take the baby to the hospital please professional doctor check analysis its reason. In addition, timely and reasonable feeding after birth, can reduce or avoid the happening of physiologic weight loss.
"The horse tooth"
In the oral cavity jaw line and parts of the gums, yellowish-white, the size of a grain of small particles, namely commonly known as "the horse tooth", "the horse tooth" is a normal physiological phenomenon, mainly due to the epithelial cells or mucus glands secrete storing up to form, can be naturally subside after a few weeks, parents bear in mind, not with a toothpick prick, lest produce infection. But a few in incised tooth or other parts have a premature newborn babies teeth, namely medical birth baby teeth or referred to in the teeth, the precocious tooth most activities fall off easily and inhalation of respiratory tract, therefore, need to pull out.
Breast enlargement and fake menstruation
Some men's and women's birth there will be 4 ~ 7 days after breast enlargement, such as beans or walnut size, 2 ~ 3 weeks after can fade, avoid by all means is squeezed, lest 2
3 cause infection; Some girls a little bloody 5 ~ 7 days my vagina secretion, such as come menstruation, or discharge the purulent secretion, sustainable for a week. The above two cases belong to a normal physiological phenomenon, mainly due to from the maternal estrogen interrupt, don't be too too anxious parents can bear.
Neonatal lupus rash and millet
1 ~ 2 days after the baby, in the head, torso and limbs often appear sizes of pleomorphic maculopapule, called "neonatal lupus, 1 ~ 2 days later disappear naturally. Also can
because of the sebaceous glands are stacked in the nose, nose, facial form small the size of a grain of yellowish-white skin rashes, referred to as the "newborn millet rash," peeling after disappear naturally.