Totally normal, mama! Sa ganitong edad, ang tongue thrust reflex lang yan, automatic response ng babies para malaman kung saan ang pagkain, kaya parang palaging labas ang dila nila. It usually goes away around 4-6 months, pero some babies do it longer pa rin habang nag-explore lang sila ng mundo. Walang dapat alalahanin unless may ibang signs like difficulty feeding o fever, pero from what you're describing, it's just your little one being a typical newborn.