It's hard to get a good idea of his size, but if a local store has some small crickets, it might be good to switch to those as soon as you can. Bigger food will allow you to gutload, and make feeding generally easier. Toadlets will also go through a frankly depressing amount of food their first year. They also digest fast, so don't be surprised when it goes from practically spherical to looking like it's starving half a day latter. Just keep stuffing the little bugger as full as you can. I think I fed mine three or four times a day (yay college) when he was that size, and he was fine with it. He's going to eat a ton, especially if you're feeding food as small as is recommend. Consider breeding pinheads.

That rant said, I'll get to my point. Trouble eating/catching food is commonly associated in toads with a lack of vitamin A in their diet. Are you supplementing with multivitamin as well as calcium? How long has the container been open? How often are you giving him the multivitamins, and what kind is it? It's recommended to replace multivitamins every 4-6 months after opening. Speaking from experience (unfortunately) these things can get worse quick if you do nothing. If he really is having as much trouble as you say, this might be a warning flag.