E.D.
My daughter is also 4 months old and often does the same thing. She'll stay latched on for maybe a minute, but then pulls off. She'll go back and forth like this until she's done. I think she's just getting distracted. She's so much more aware of her environment now. I notice she does it more when I'm talking, her brother is doing something nearby, or when the room is noisy. I've been beginning to wonder if I'm going to have to find a quiet place to feed. We were just at the doctor and her weight gain is fine, so I'm not worried that she's not getting enough milk. She's still eating on the same schedule as she was before this started happening so that makes me think she's getting the same amount of milk. I'm just going to try to keep the distractions to a minimum so feedings don't take forever! Hope this helps!