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Regarding Harry's christening: According to whitehound:
The average age for a baby being christened in Britain seems to be about seven months (judging from a quick survey of fourteen examples mentioned on Google!), so if she means that the christening was "hurried" in the sense of being rushed into that means it was prior to February 1981, and Snape had already warned them about the security leak and the threat from Voldemort by that point.
A hurried christening does not signify that the Potters were warned prior or even shortly after Harry's birth if it is common for Brits to have christenings several months after a child's birth.
The average age for a baby being christened in Britain seems to be about seven months (judging from a quick survey of fourteen examples mentioned on Google!), so if she means that the christening was "hurried" in the sense of being rushed into that means it was prior to February 1981, and Snape had already warned them about the security leak and the threat from Voldemort by that point.
A hurried christening does not signify that the Potters were warned prior or even shortly after Harry's birth if it is common for Brits to have christenings several months after a child's birth.