D.R.
if you have been breastfeeding exclusively, and doing it fairly consistently from one breast at a time, and his weight gain is good and he is doing well, then all it probably means is that your milk production is in synch with what and when he eats. your breasts will produce what is needed, and around 3 mos is when things usually really fall into place. its not a sign of your production decreasing, rather you are producing only what he needs when he needs it. i usually did one breast at a time also. it just means that you are doing a great job and you can continue breastfeeding the way you are for as long as you both want. good job, mama!