| What are you calling a small seedling. I buy hundreds of 2 inch pots immediately re-pot to 4 inches and flower most within a year.
One very real problem with 2 inch pots is if they are pot bound (all except miniatures and some semi miniatures) the roots start to strangle themselves and the plant fails to develop properly.
I do not find that humidity around the plant to be very important at this size, but do not let them dry out for long. The stress of drying out will often put them into hibernation and it could be months before they begin to grow again.
Baggies can work if you keep a close eye on the plant but it can also encourage rot on Cattleya.
Your photo looks like a Zygopedilum which by the way likes cool temperatures.
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jerry  |