An object of the present invention is to provide a brain function improving agent for neonates, especially, newborn neonates. According to the present invention, there is provided a brain function improving agent for neonates, comprising a lactic acid bacterium and/or a Bifidobacterium. The brain function improving agent or composition for improving brain function for neonates according to the present invention is advantageous in that the use thereof can improve the developmental quotient without any side effect and also enables effective development and growth of neonates.
