What waist length to get abs?

I'm a 16 year old boy, I have a waist length of 31 inches, after workout i can only barely see my abs(i have been working out for 2 days)I run for 1.20 hours through rocky terrain and against the river flow sometimes. I weigh 134 pounds and I am 177cm tall. I can still grab a small hand full of fat off my stomach but i'm guessing this is baby fat? Can anyone give me a bit of help? thanks!