Transplanting Problem???

I can't tell quite what went wrong, but it was a healthly looking seed that germinated quickly. i didn't notice and it had grown leaves and about a two inch root before i put it into the soil, taken from the backyard garden. grew healthily for a few more days, but now the stem looks like it's wilting and it's falling down. the leaves are still green and all, but the stem looks like it's dying. sorry i acn't put pictures, i don't have a camera, but any input as to what might be going on would be appreciated. thanks!

Welcome to the forum. I can't tell what it is you think you did right. Your problem right now sound like you have ovewatered the plant or by using soil from outside you have introduced a problem. Could even be more nutrients than the plant can use. You will need to do a lot of reading if you intend to follow thru with this. You'll be glad you did. VV
PS. a moisture meter might help, around $15.00. available at lots of places.

yes too much water. this once happened to me when my plant baby like yours died i cut it off and stuck it in some rooting powder/gel and ive still got her.have you only got one plant?

Damping off is a stem rot problem where a seedling will suddenly keel over and die or the seed will germinate and never develop. It occurs in most soils – both in the garden and in the greenhouse if the right conditions exist.
In general, cool wet soils support the development of the damping off fungus (rhizoctonia) and seedlings either die in the seedling flat or die upon transplanting. I note that I’ve never seen older, established plants attacked by this problem but I’m told it can happen. Older plants develop a secondary stem tissue that forms a protective barrier and stops the fungus from penetrating the stem. Having said that, the fungus will still attack roots and parts of the stem of a weak plant in cold, damp soils causing a sub-standard seedling or plant.
How do you know you have damping off?

gotta be damping off then, cause that's exactly what happened. allright, thanks, i'll give it another go, that one already died beyond repair.

And next time use sterilised compost insteaod of pathogen riddled garden soil.