Frustrated 😢

So my almost 5 month old (a couple weeks ) was taking a 7oz bottle most of the time with about 3.5 hours in between. Now she only takes 4.5 to 6 oz. (I hate wasting formula we can’t afford to) We tried to change the nipple to a 3 but it’s still too fast for her. She tries to sit up while taking it and loses interest real fast and then refuses it once I try again. I am tired and I am the only one with her all day. Daddy comes home from work and tries so hard to give me a break but she only wants me. She is teething like crazy. Maybe she’s just changing her body’s schedule? She does sleep through the night mostly although we have dealt with sleep regression recently. She is refusing to nap in the first half of the day (lucky if there’s a 20 minute nap). She’s stubborn lol. I’m at a loss. Guess I just needed to vent. Thanks for listening if you do! 💕