I don’t know what to do with my babies all day!!

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I am on maternity leave, I have a 2 month old and a 16 month old. I have no idea what to do with my older son, I feel like he’s getting so bored. It’s cold, so we can’t go walking or to the park. I feel so bad, because he goes to daycare so he’s used to being with other kids. We just sit in the house all day. Any ideas would be great!!