How early is too early to let my infant sleep through the night?

Last time I talked to my doctor, my daughter was 3 weeks old and my doctor told me I should not let her go longer than 4 hours between feedings. However, my daughter is now 7 1/2 weeks old and sleeping up to eight hours at night, and I love that, but feel guilty for not feeding her. But she isn't fussy and is... show more Last time I talked to my doctor, my daughter was 3 weeks old and my doctor told me I should not let her go longer than 4 hours between feedings. However, my daughter is now 7 1/2 weeks old and sleeping up to eight hours at night, and I love that, but feel guilty for not feeding her. But she isn't fussy and is still getting 7-8 feedings every day. Is this okay?
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