ITA with doerksend. Sounds like hindmilk/foremilk imbalance. It's not a 'problem' in that it will 'harm' the baby or anything. Sometimes (especially with first time mothers) the breasts over supply more than usual and the baby gets a bellyful of lactose-rich foremilk very fast. It settles down after afew weeks, maybe 2 or 3 months or so. There are lots of tricks.
Feed leaning back/lying down to slow the flow.
Express before a feed, just until the first letdown has finished.
Let baby feed off one side only for a couple/few feeds. I used to use one side for about 4 hours before changing over,. Remember to express a little from the non-used side to relieve engorgement (you shouldn't need to worry about supply dropping as they will both get used about the same in 24 hours)
I had a really strong letdown and foremilk imbalance but in the end I only did these things when I could be bothered, they all helped a little, but when all was said and done we both grew out of it after a few weeks without any dramas.
I was told that if the baby only feeds for short periods in the first few weeks (due to the fast letdown) that milk supply can fail after about 3 months due to not enough of the ducts getting stimulated properly, so I was more worried about this and was paranoid about keeping her on the breast for at least 1/2 hour each session.
She's 2.5 and still nursing strong