First language acquisition is one of the steps in developmental milestones of children. Although nature and nurture are needed to foster language development of children, family plays a crucial role in inspiring both production and comprehension of language. Thus, motherese and fathers help them to identify different speech sounds used in their surroundings. Further siblings, peers, neighbors, relatives from an extended family also take part in the stimulation of language. In northern part of Sri Lanka, earlier lullabies were sung by the mothers or grandmothers for their children or grandchildren to make them sleep. Beyond this purpose the lullabies have done a significant task, that is they contributed enormously to comprehend mother tongue and stimulate language production also. Hence it is the basic component of language competence. Wonderful poems were sung with music to make lullabies. At the initial stage of language acquisition, accent was considered as one of the prominent aspects. In view of that, lullabies were improvised with various accents which promoted language acquisition amongst children. And unique aspects of Lullabies such as simple phrases, rhyming words, distinguished speech sounds facilitated children to stimulate different speech sounds used in their mother tongue. Though this practice is being dropped by society later, it is one of the prosperous sources for the acquisition of first language.