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The cat slept 18 hours each day for a total of 18*7 = <<18*7=126>>126 hours for the week.
The baby slept 91 hours total for the week, but we don't know how many hours per day.
To compare the proportional relationship, we need to find the average number of hours both the cat and the baby slept per day.
The total number of hours in a week is 7*24 = <<7*24=168>>168 hours.
So, the average number of hours both the cat and the baby slept per day is 168/7 = <<168/7=24>>24 hours.
Since 18 is less than 24 and we don't know how many hours the baby slept per day, we cannot determine if the baby slept fewer hours per day than the cat or if the cat and the baby slept the same amount of hours in total for the week.
However, we can conclude that both the cat and the baby spent less than half the hours of the day sleeping.