Baby formula feed 1.5 - 2hrs

My baby is formula fed, is it normal for him to go from previously every 3 hours to 2 hourly and sometimes even 1.5hr, especially at night he will cry. We did increase to 60ml, but we notice he tend to spit out milk quite frequently so we decreased back to 50ml. Is this normal. My baby is 16 days old And yes baby is always swaddled, burp after everyfeed, pacifier when needed, stomach is soft.