holy cow--.04 grams? and they had ones that were smaller?!? (okay, i'm just going to go ahead and contain myself and not have my head explode onto your nice pretty thread.)

so anyhow, go ahead and put some of the cgd in for him now and mist his enclosure well. you may have to hand feed him the cgd to get him to take it at first since he is used to baby food. go very light on cricket feedings for the first few weeks so that he can get used to eating the cgd and not rely on crickets for food as they don't contain all of the nutrients he needs.

consider putting him in a small or medium kritter keeper for now, especially while you are getting him established on cgd. he is very little and will need all the help he can get finding his food.

the red on his chin and belly is referred to as blushing and is common in cresteds. when he fires up it likely gets much darker/brighter red.

hatchlings are jumpy but they do calm down with regular handling (and hand feeding), however i recommend not handling too much until they are 2-3 months old. before that they are more delicate and tend to leap out into nothingness (which means they may hit the floor hard) out of fear and just plain hatchling jumpiness.