No pee/poop diaper since...

Brittanie • Ariel Diana Nichole was born 9/7/16😊 Pregnant with my 2nd 💕
Little Ariel had her last pee/poop diaper around 5:30-6ish PM yesterday evening. Fed her around 7:30. She became really fussy, figured out an hour later that she was hungry again, she drank that whole bottle (2 oz). Then AGAIN around 10PM last night, but we used the pre-made formula to see if it helped any, drank that bottle as well (2 oz) and smiled in her sleep for a good 3 and 1/2 hours. Woke up around 3:30am to feed again, drank her bottle, was a little fussy but fell asleep after about 10 minutes. Fed her at 6:30am this morning, but upped her bottle to 4 oz to see if she just wasn't getting enough, she's sound asleep right now. But why is my girl eating so much, and hasn't used the bathroom since around 6 in the evening yesterday? Anyone else go through this? I'm worried... Or am I just gonna receive a big blow out diaper and there's nothing to worry about? She'll be 4 days old at 11:47am today. Thank you girls! -ftm 
•••UPDATE
SHE POOPED! Asked my mom what I should do, she told me to warm up 2 oz of water, and to put a tspn of syrup in the warm water to let it dissolve. She drank 1 oz out of it, and BLOWOUT!! She didn't even stop to finish the bottle, she strained in the middle of drinking it! Thank you Jesus!