Gestational age at birth (weeks) 43 42 41 40 39 44 45 46 47 48 49 Length (cm) 30 27 28 29 31 32 33 34 35 Head circumference (cm) 5.25 4.75 4.25 4.00 3.75 3.50 3.25 3.00 2.75 5.00 4.50 Birthweight (kg) 50 49 48 47 46 45 44 43 51 53 54 55 56 52 Length (cm) 35 30 27 28 29 31 32 33 34 36 37 38 39 Head circumference (cm) Ref: Villar J et al. Lancet 2014; 384: 857-868 © University of Oxford 33 34 35 36 37 38 39 40 41 42 43 33 34 35 36 37 38 39 40 41 42 43 Birthweight (kg) 1.00 1.25 1.50 5.25 4.75 4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50 2.25 2.00 1.75 5.00 4.50 INTERGROWTH-21 st International Standards for Size at Birth (Boys) 3 rd 97 th 90 th 10 th 50 th 3 rd 97 th 90 th 10 th 50 th 3 rd 97 th 90 th 10 th 50 th