Mate they seriously need to come indoors for a bit. Not sure whats going on with them but its obviously somthing happening from the plant being outside this early in its life, its very delicate at this stage, (if possible) you should bring the plant indoors, keep it in the pot its in now but if i were you i would replace the soil, the soil in the pics above looks a bit poor quality. Just keep it watered (not too much) add a little if no nutrients, its young anyway, dont really need any nutrients yet, you should start to give it nutrients when its a little bigger. If you do this your plant will be fine.

Summary, all in all mate you should bring the plant(s) indoors, replace the soil with some nice compost from B&Q or Homebase or any Garden centre. And keep your little plant on a sunny window sill until its healthier and about 50% bigger than it already is. When its a bit bigger and its looking nice n healthy you could put it back outside again.