Sleep regression does not cause feeding issues like the ones u describe. But it could be a growth spurt or teething phase where they are more fussy and if teething gums can be sore so feeding is a chor. I mix feed but mostly bottle by 4 months. My boy was also like that but that time he got hfmd - we didn't even know - caz of fever then go kk then the doctor check n saw ulcers in mouth. Maybe u want to check his mouth? Sometimes there maybe ulcers but no spots on body for herpes or other viral infection. My boy also like that these few days. Allow 3 days or so, if still feeding no good then bring go doctor. Formula or DL will not change the situation.
Maybe u also wana use a toy or something to distract and let him play while u latch him?
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