Have googled and it all relates to breastfed babies.
DS2 (4 months) has been refusing to feed for the last 3 days. He has got a cough/cold so I wondered if he is struggling to suck but will quite happily suck on a dummy for ages.
Every bottle he has one suck, screams for a bit, has another suck, screams for a bit etc. I calm him down with his dummy which he is quite happy with and try again and can usually manage to get him to suck (on and off) but he is only taking about 3oz at a time.
He is still sleeping through and isn't screaming for milk more than normal - has he just lost his appetite?