So, I realized that the "infant" versus "children's" liquid Tylenol formulations we'd found were the same strength, and I nearly bought the cheaper children's version. But then I realized that the infants formula contains an extra key ingredient: high fructose corn syrup. Judge if you must, but this stuff tastes great (yeah, I tried it). My baby takes this stuff happily, without dilution, straight in her mouth, no complaints. When confronted with a super-fussy, teething baby, it's really nice that she actually likes her medicine. And of course definitely check before you buy, to make sure that the formulation hasn't changed!
This medicine has been very helpful with my son having a cold this week, but the red color gets on everything and stains it. He fights taking medicine so I have to be careful because of the color.