can anybody help me ?

I planted some seeds I bought online an they seem to barely sprout and have a couple leafs on them but recently one of the plants has its bottom leafs yellow I dont know why doesnt look like anything I seen before ? Anybody have an idead why this happened

Pics please. It will greatly help you in receiving responses to your questions. Also, How many weeks, are you feeding them at all, what medium are you using. etc.

yup need more info or pics

The pre leafs(first two to sprout) will die off. Pics will help

Most likely it was the rounded "pre leafs" that fell off... some plants do this and some do not... It should be fine, but if you could post a few pics we could help you out better

Too little light? No nutrients in the soil? Root bound?

Kinda hard to diagnose a problem without pictures, particularly if you are slightly poor at exploiting the descriptive power of words (a picture will paint a thousand of them for you).