Help! Vegan milk for toddler?!...

Hi vegan moms out there! I need your help , rexomandations and experience with vegan milk for a 2 year old boy. You fill you in a bit: my 2 year old boy is drinking special fortified soy milk for 1-3 years olds, since he was ~ 14 months. From everything what I read out there about soy milk I am beginning to be a bit worry....especially that lately his having really bad mood swings...:( and I am thinking to stop for a while with soy milk and try something else for him. But I have no idea what milk to give him....I am trying to research buy I am not finding anything helpful:(. Please help!