For those who are new to growing tomatoes from seed, it can be hard to know if your plants are growing on schedule as they should or whether they are behind. I've gone through my photos taken this year to give you an idea of over the course of a little over a month and a half about how your tomatoes should look. This covers from when I planted the seeds to when I moved them outside to harden off to when they were ready for sale/planting.
I keep my tomatoes inside in the warmth of the house until they are ready to be planted outside. At that point they go outside to be hardened off. Previously that meant outside in the sun for several hours and then back indoors at night. Now that I have a portable greenhouse, they go into there and I can close that up at night. Until they're ready for that, they stay indoors under the lights. Otherwise you can severely stunt their growth. They should not be moved back and forth from indoors to outdoors while they are small.
This should give you a better idea of how things should grow over that time. Next year I'll work on trying to take specific pictures of each seedling type daily so that we get a better idea of progression.
You can view the photos here in the gallery.