I am slowly nutting out what the feeding problem has been. I noticed I can squirt across the room at times so then I realised I have fast let down. Much googling later and I think the formula would be helping him, as it has a probiotic, so I've ordered some of those, they are expensive though, but worth a try.

In the meantime I am going to have him on one side for each 3-4 hour block and give smaller top ups throughout, rather than BF in the morning and the two big bottles later in the evening and night.