RT Journal Article SR Electronic T1 Matched development of a pair of monozygous twins of grossly different size at birth JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 472 OP 476 DO 10.1136/adc.49.6.472 VO 49 IS 6 A1 J. M. H. Buckler A1 A. Robinson YR 1974 UL http://adc.bmj.com/content/49/6/472.abstract AB Monozygous twins had birthweights differing by 1ยท64 kg. The smaller twin, only 45% of her sister's weight, rapidly caught up, and at the age of 10 years physical growth was similar and there was negligible difference in their intelligence and educational attainment.