My daughter is a NICU (NeoNatal Intensive Care Unit) RN at a Children’s Hospital and they love boating, her daughter was born in February 5-weeks early. Now, at 4-months she is 13lbs so daughter did research and most documents say a Infant should not be in a Life Jacket or Boating until they can sit up by themselves.
They also advise testing them with your child in a pool to make sure they will right themselves if the Worst Case happens.
Yes, she wants to be on the water and so do I, but nothing is worth chancing when it comes to the life of your Child/in my case Grandchild.
Good Luck and stay SAFE!