Kirkland sensitive formula vs similac sensitive

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Hello, my baby is 6 weeks old and is exclusively on similac sensitive right now. He began with similac advance, but was excessively gassy and fussy. Similac sensitive suits him and he is at his best. I was wondering if anybody has tried shifting to Kirkland sensitive. Kirkland is much much cheaper than similac, and with baby’s growing needs similac is getting expensive. Your inputs would be much appreciated.