My DS is 10 weeks old, EBF. For the first 8-9 weeks he was nursing about every 2-3 hours for at least 30-40 minutes per feeding. The last week or so he has been nursing every 3-4 hours for less than 15-20 minutes and often he will only nurse on one side per feeding. Is this normal? Is he getting more efficient or something? Should I keep trying to put him back on the breast? One time I kept putting him back and then he threw up the whole feeding. I guess that was my fault? I'm new at this. Thanks for the help!