Disclosed is an agent for facilitating the development of the brain in an infant, which comprises an effective amount of a milk-derived phospholipid or a sphingomyelin. Also disclosed is a food composition for improving the nervimotion and/or the learning function in an infant, which comprises the agent. For direct intake, the agent preferably comprises at least 0.027 wt% of a milk-derived phospholipid or at least 0.005 wt% of a sphingomyelin.