Average of BLLs in Ban Thi was 15, 41 ± 6, 44 µg / dl and in Tan Long was 13, 47 ± 11, 48 µg / dl, in two sites was 14, 41 ± 9, 42 µg / dl - The height was lower from 1 to 4 cm, the weight was lower from 0.5 to 2.5 kg, the chest index was lower from 0.5 to 1.3 cm and 23 the BMI was lower from 0.12 to 0.3 of all age groups among those having BLLs ≥10 µg / dl (p> 0.05) - Hb index in children having BLLs <10 µg / dl was 123 g / l higher than other group with 120.08 g / l (p <0.05) - Children having BLLs ≥10 µg / dl had a higher risk of anxiety disorder and attention-deficit hyperactivity disorder according to DBC-P and Vanderbilt scale (p <0.05) 4.2.