Ay, nakaka-alala talaga yan, mama! Pero honestly, 8 months onwards maraming babies ang nagsisimulang mag-experiment ng mga sounds kaya yung gulping sounds na yan (ahm ahm ahm) ay maaaring normal lang, parang exploration nila ng tongue and swallowing. A few of my mum friends had babies na ganyan, at sabi ng pedia nila normal development lang, pero since nag-worry ka at may weird pattern siya, I'd really suggest checking in with your baby's doctor just to be sure, lalo na if accompanied ng iba pang signs like feeding difficulty or drooling too much. Better safe na, right?