Welcome to the forum!
6 weeks certainly is a classic time for a growth spurt. Though spurts can occur at any time, many moms notice them around 3 weeks, 6 weeks, and 3 months. During a spurt, a baby may change his feeding pattern pretty drastically, usually increasing his nursing frequency. This could be perceived as snacking, especially if mom is used to a feeding pattern where the baby takes in less frequent large "meals".
As long as diaper output remains normal, I don't think this is anything to worry about. It's probably just a spurt, and if it's not, and your baby really has altered his pattern to become a "snacker", that's still perfectly fine. I know a lot of people- including some doctors and the authors of popular baby care books- will tell you that babies "should" only feed every 3-4 hours and that snacking is bad. But that's not true. A "snacking" eating pattern is very normal for a breastfed baby. It can be inconvenient for mom, though! Some things you can do to encourage your baby to eat more are:
- try breast compressions to speed milk to the baby and keep him awake
- when nursing slows, take him off the breast, burp him, change his diaper, and put him on the other side, and repeat the process until you just can't keep him awake any more
You also might want to try wearing your baby in a sling. Sometimes an increased feeding frequency is more about a desire to be close to mom than about true hunger.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"