Infant vocabulary development assessed with a British communicative development inventory

Communicative Development Inventories (CDIs) were collected from 669 Britis h children aged between 1;0 and 2;1. Comprehension and production scores in each age group are calculated. This provides norming data for the British infant population. The influence of socioeconomic group on vocabulary score s is considered and shown not to have a significant effect. The data from B ritish infants is compared to data from American infants (Fenson, Dale, Rez nick, Bates, Thal & Pethick, 1994). It is found that British infants have l ower scores on both comprehension and production than American infants of t he same age.