Your baby may need to feed from both sides to feel full enough, especially during growth spurts. Sometimes, even both sides is not enough. However, when you feed from one side, the other side can start leaking or even spurting. I use a special collection cup to collect milk from the other side while latching to one side, then feed the baby the collected milk via a syringe, followed by latching onto the other side, so there's less wasted milk :)
Y latch instead
Yvonne