sentences:  Smaller, premature infants are more susceptible to the reflex, with an observed occurrence in a child of 26 weeks gestation.It is named after the Russian physiologist, Boris Babkin.This reflex occurs in slightly older infants (starts between 6 and 7 months and become fully mature by 1 year of age) when the child is held upright and the baby's body is rotated quickly to face forward (as in falling).