Anyone know what could cause my son to not want to eat as often the past two days? Like the last…

Anyone know what could cause my son to not want to eat as often the past two days? Like the last time he wanted to actually eat today was around 4. I'm worried. He's 2.5 months. He is breastfed. He just wants his pacifier, I keep trying to offer the breast and nothing 😕 He gets mad and wants his passy