Kids cruise free

Planning for a cruise next year and was wondering, When I check the the pricing for this summer, some of the cruise shown as free for Kids (age 3 and 1). However, when I go to next year, most if not all the one in the summer have a charge to it. I noticed that in the fine print section it said select cruise. So I'm wondering if kids cruise free are only offer during the slower season?

My kids are free on our Seaview sailing for June 2019

I'm trying to book the Seaside, I guess no kids cruise free during the high season in the Caribbean.

I had kids sail free for our seaside b2b weeks for June 30 and july 7 2018.

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Kids sail free.

Could it be the port fees and tax you see being charged for the kids?

Directly from the MSC website

Children 11 and under at time of sailing cruise free on select sailings. Kids must sail as 3rd/4th guests when sharing a stateroom with 2 full-fare paying adults to qualify to cruise for free. Charges that apply (where applicable) for kids cruise free are taxes and port dues, flights and transfer fees, and add-ons.

Children from 12 - 17 years of age at the time of sailing travelling in a stateroom with two full fare-paying adults do not pay the cruise fare on select sailings in low and mid-season; they may pay the cruise fare in high season. This offer is subject to limited availability and must be reconfirmed at the time of booking. They must still pay taxes and port duties, insurance, flights and transfers (where applicable).

after calling MSC, they said that there will be charges for my kid that is 3 years old, but not the one that is under 2. Looks like they changed the policy starting this summer.