P likes anything colorful or noisy; it's a plus if he can hold it or grab it. He also likes looking in the mirror. He really likes to practice sitting up too - either on my lap or in the Bumbo!
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My DD really likes her playmat. When she's done with tummy time, we let her lay down and swat at the toys above her. Although right now her absolute favorite thing of all is one of our dogs, Toto (see siggy pic!).
Re: 4 months old?