After delivery .14 TSH rapidly 300 10 rise reaching 250 60~80uU/ml 10 levels, and then200、 8 slowly decline 150 over the next 6 few days(5-7d) 100 to <suU/ml 50 T3 2 levels 30 Birth 2 4 6 GESTATIONAL POSTNATAL AGE (wks) AGE(wks)• After delivery, TSH rapidly rise reaching 60~80 uU/ml levels, and then slowly decline over the next few days(5~7d) to <5 uU/ml levels