I think most pros don't use too much nitrogen because it tends to produce "soft" bulbs, I don't know if this is true or not but I do think it makes for floppy disease prone leaves. I feel like compost provides more than enough fertilizer for daffodils, but if you want to add one of the bulb fertilizers, that should help the young bulbs just as much as mature bulbs.

Whatever you use make sure it's soluable enough to make it down through the soil to the roots in time for the plant to use it (for example bone meal won't help if you spread it on top of the soil right now, the roots are no where near it)

Maybe Sue will have something to add, she has been known to plant a daffodil or two.

Have to wait at least 3 years for tiny daffodil bulblets/seeds to mature and flower. The time to fertilize is when they first break through the ground, or after bloom, before the greens wither and go dormant. Bulb 'food' or bone meal is fine. I don't use fertilizer on mine, they seem to grow healthy without it. At any rate, it won't make them grow faster. 'Patience weedhopper' :-)