How to handle excess leaking/fast letdown
A letdown is the milk coming out of the breast on sucking. Milk doesn't flow like a tap all the time.;
Forceful letdown or a fast letdown is when the milk comes gushing into your baby's mouth
If you want to know how that feels put a faucet in your mouth and spray. (Not pleasant at all!)
Signs of a fast letdown

1. Baby doesn't latch deeply

2. Baby keeps biting the nipple especially in the beginning of the feed to reduce the fast flow.

3. Explosive potty, uncomfortable and rash causing.
Solution

1. Change posture and recline and feed. In my experience does not help that much.

2. Haaka pump. Passively pump with haaka before each feed.
Warning

Don't use regular breast pumps as that will stimulate the breast more and cause more milk production.
If you cannot find/afford a haaka pump, hand express gently.
What to do with the collected milk?
1. Can feed the baby later with katori and spoon

2. Can store and donate to breast milk banks