What temperature are you incubating at? 45 days is extremely early for a crested to hatch out.
Does it seem ok structurally and developmentally? You don't need to worry about feeding it for the first few days as it should still be getting nutrition from absorbing the yolk sack (hopefully that all happened correctly in this case). After that, start it on very thin and soupy CGD as this is easier for babies to eat than thicker diet. Use a very shallow feeding dish--something that the gecko can practically walk into (I use deli cup lids). You can also do as mentioned above and place a tiny bit on the gecko's nose for it to lick off, but sometimes babies are very skittish about this right after they hatch out so it may take several feedings for it to be comfortable with you doing that. Make sure to handle this one as little as possible though for the first few weeks--it is likely more delicate than the normal hatchling and the less stress the better.
I would also keep the enclosure very humid for the first few weeks for this little one. Not only do hatchlings need higher humidity, but in my experience hatchlings that are a little early or on the small side do better with a more humid environment while they get started.
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