Gripe Water

Hi mummies! My mother in law bought gripe water and insist that I feed it to my 3 week old newborn. Is this advisable? She even insisted that I feed my baby cerelac at 1 month old so that baby won’t be hungry and keep waking up every 2-3 hourly every night. I really don’t wanna give all this to my baby... I really don’t mind waking up at night to feed baby.