DS is 3.5 months old, he's always sort of preferred feeding on one side over the other but just lately it's been getting worse. He arches his back and grizzles, turns away or bites when I try to feed him on the side he doesn't like unless he's just woken up from a sleep or is really really hungry. I try to offer the off side first most times before switching, but sometimes he just flat out refuses to latch on. He feeds fine from the other side, I think the flow isn't as fast as the off side is quite fast and tends to be the one that leaks even if he's just fed from it.

If he continues this way, feeding the majority of the time from his favourite side is it likely to cause problems? I don't normally suffer from blocked ducts or mastitis thankfully, but don't want to encourage this if it's likely to increase the chances of getting it. And any other ideas on how to get him feeding from both sides equally?