Hi mamá! Please go to your OB or emergency room right away para ma-check, sudden sharp belly pain, lalo na at 4 months, kailangan talaga ng professional check-up para ma-sure lahat okay lang sa baby at sa'yo. Hindi ako makakapag-diagnose online, pero importante talaga ito, okay? Sending you hugs, I'm sure your doctor will put your mind at ease agad!