It's too soon to tell what the answer is because it takes a long time to find out patterns of behavior with a large whale. Also the babies might take longer to become trained. And whales have brains so they might decide to leave earlier or later. There's much more to say about this complicated question, with natural and human-caused environmental changes all playing a part. Even though a whale is big and heavy, it is not as heavy as the water it pushes away, so it floats.
Saltwater is denser than fresh water, and everything floats more easily in denser water.
We challenge you to research further. We also think in a couple of months the number of calves would go up because the numbers keep on going up, down, up, down. We think it will go up. Experts offer several possible reasons for the downward trend of the past two years. Some think the low number of calves over the last two years is due to poor feeding seasons for the gray whales during summer in the Bering Sea.