birthday and christening

Hi, mga momsh? patulong nmn po, kc my will be celebrating my son's 7th birthday by the end of december and we're planning to give him a party. Then by 1st week of december manganganak nmn ako, so naisip ko n isabay ung binyag ni baby s birthday mg kuya nia, tingin nyo po possible kya un, naguguluhan kc ko mag isip kng pano maging set up? thanks po s mga magbibigay ng feedback. Godbless