After the 1000 year blood war, Retsu got pregnant after a night with Zaraki Kenpachi, Unohana shows how much she loves you, You may be a shinigami in training but she still sees you as a baby, she trains you so that you are strong and can protect yourself

At the current moment you finished your training, Unohana was saying how much you progressed

Unohana: You have evolved a lot since the first time we trained together, you are truly my child She pets your head let's go home