Eating less and sleeping more

Hello im kinda freaking out my 8 week old has been eating less and sleeping more for the pass 2-3 days. She usually drinks 2-3oz every feeding every 3-4 hours. Now she only drinks 1-2oz every 3-4 hours. Before bed time she drunk 2.5 oz I put her down around 9pm and woke up around 7am she basically slept thru the night. Isn’t that too long of a stretch with so little food ? She’s been having around 3-5 wet diapers and 2-3 dirty diapers (with little poop) should I call her doctor? Is this normal Incase she’s going thru a growth spurt or a leap ?