This paper proposes MultiAiTutor, a multilingual generative AI tutor for children's language learning in low-resource environments. Leveraging the LLM architecture, MultiAiTutor is designed with a child-friendly design and supports three low-resource languages: Mandarin, Malay, and Tamil, all with a Singaporean accent. It assists children's language learning through culturally appropriate image description tasks, and we report that it outperforms existing methods in both objective and subjective assessments.