My baby dreads at a little over twenty days old! (they have only been fully roughed in for about ten days though) 

They are pretty tight from backcombing, but still fall out a bit every time I take a shower just from the water. I use all natural vegan soap that leaves no residue (yuck! no smelly dreads for me) and usually twist them while they are are drying so I can start making the baby hairs stick. When they are fully dry I backcomb some of the areas that seem really loose (usually the ends) and wax them to keep the frizz down.