Ok ladies, my husband and I are disagreeing over how many car seats we need. Right now we have three high back harness/boosters, one 4-in-1, and an infant carrier seat. Expecting our third in November. I was thinking we really don’t need another. He insists that he NEEDS a seat for all of them in his car (which then means he NEEDS a new one even though there is no scenario where he’d have all three without me). Once baby outgrows the carrier then we will put baby in the 4-in-1 and upgrade middle sis to the high back harness (she’ll be 2.5 by then) and big sis (5.5 by then) will still be in the highback too. Maybe one more highback? Thoughts?