Aw, first time mom worries talaga, I get it! Pero honestly, kailangan mo talagang i-check ito with baby's pedia kasi maraming reasons kung bakit may bulge, pwede itong normal lang, gas, o kung may ibang kailangan tingnan, better safe than sorry talaga especially pang-baby mo, ha. One of my mum friends had something similar at nag-alala siya, pero na-clear out lang ng dili after check-up, so don't stress too much yet! But yeah, make an appointment ASAP para may peace of mind ka na.