To understand the prevalence of thyroid hypofunction (CH) and phenylketonuria (PKU) among newborn in Penglai in order to find and treat them in time.

为了解蓬莱市新生儿甲状腺功能低下(CH)和苯丙酮尿症(pku)的发病情况，以便早期发现、及时治疗。