Whoa... 45 grams to me doesn't sound like an established eater. That would have meant he was hatched at 25 grams or so which is highly unlikely.
I agree with spitzu, 6 weeks is too long to wait out a 45 grammer. I'd go and assist-feed. If you're not comfortable with that, try to find a breeder close to you who can help with this.
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