Hi, I'm new here. I'm the mother of a 5 year old boy who's had some mysterious symptoms and this forum has hugely helped me figure out what's going on.
He was a vegetarian since birth (and I'd been a vegetarian while pregnant w/ him and for years before), and around ages 2-3. he started having "sad" episodes that would come and go. By age 4.5 they'd gotten much worse, he was genuinely depressed and talking about death (!) and was also tired and pale, hands very cold, etc. I finally realized that he probably had a b12 deficiency, though tests were inconclusive.
I started giving him b12 on my own, but there's so little out there re toddlers and young children and b12. He actually got worse at first--when we introduced fish and meat to his diet, and also when he started taking b12 supplements. We had to start super low, like 60 mcg/day, for him to not react poorly and go a little crazy. Little by little, through trial and error and over the course of months, I've finally gotten him up to 1000 mcg/day, and the transformation has been amazing. We got our happy, easygoing, playful, curious child back! But again, there's been a lot of trial and error.
Just a couple of days ago, I saw the old sadness and paleness come back, and I'm not sure why. I had switched to new supplements (by Jarrow)--a 1000 mcg pill rather than 2 500 mcg pills--but I can't imagine that's the cause. He's not taking folate--should he be? He usually eats a good diet but maybe with that much b12, he needs a good b complex? Is anyone else out there dealing with this in a child? Also, when can I stop increasing the dosage? Right now I'm still increasing it every week b/c otherwise the sadness comes back, but how high will I have to go before it plateaus?