DD is almost 4 months and we have nursed on both sides for each nursing session since birth. She usually does 6-10 min on one side, and 5-6 min on the 2nd. The last two days, she has only wanted one side, and flat out refuses when I offer the 2nd. She seems content, as she isn't crying or fussing (except when I keep trying to shove boob in her mouth) and will sometimes take the 2nd side if I offer an hour or so later. I am a tad bit worried about her weight gain/my supply if this keeps up. Will it just re regulate? Anyone gone through this? Hoping it's just a phase.