Despite growing interest in child language acquisition, research into
the simultaneous acquisition of two languages has so far been the exce
ption. This contrasts with the observation that there is certainly no
shortage in popular and mostly negative opinions about childhood multi
lingualism. The present paper takes a linguistic approach to bilingual
first language acquisition. Following a short introduction to current
issues in bilingualism research, specific syntactic contrasts between
German and English will be used to predict possible domains of interf
erence, interference, On the basis of available longitudinal data it w
ill be shown that the existence of these contrasts does not necessaril
y slow down the acquisition process or lead to permanent insecurities.
Special attention will be given to mixed utterances because they prov
ide evidence for children's ability to pool their linguistic resources
.