when did they start dropping nursing/formula sessions?

We started slowly with purees at 5/5.5 months but DS quickly grew his appetite and now we're up to 3 solid meals a day.... He might be going through a growth spurt too but he also nurses 3x during the day (not counting morning and before bed) and I think we may be consolidating to two daytime sessions sooner than I anticipated with the way his solids/nursing/naps fall!