Seedlings growing in green house vary with their size because of germination varied so much.
It is not unusual to see the seeds with two embryos. 60% of the seeds I sowed this time were two embryo seed. But I realized that one of the pots had 3 buds shooting, triple embryos!
It took 2 months since sowing of the seed to be as this picture. I am not sure how well the triple embryo seedling will grow, however, I would take care of it with full attention.