Until Moses left Egypt for the desert, he was still born and raised as an Egyptain. While he had jewish parents he was really trained and brought up in all the ways of the Egyptians. Accordingly circumcising his son, may have simply been over looked. The fact his wife Zippoah, knew what to do was they were Midianites who were decendants of Abraham and his second wife, Keturah, accordingly where not Hebrews, therefore their kids where not part of the covenant. Since Zippoah father was a Midianite Priest, who probably did not perform circumcisions because there was no reason to, Zippoah did not have her boys circumcise, and Mose simply went along with it.
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