Earth ElementsLittle Kids'/Toddlers' Long Sleeve T-Shirt

My daughter normally wears a 2t in tops. I was just wondering if these tops fit true to size or what?

My baby is long... he currently wears 18m clothing. will this 2t size fit pretty okay, or will it way too big?? it’s the only neon yellow i can find!!

is this shirt a bright yellow or a pukey yellow?

Is this a bright orange or darker orange?