TTC number 4

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So I have 3 kids I’m 31 years old and my youngest is about to be 2 in July, me and my husband want to have our last baby but I’m still undecided I don’t know how long I should wait, my husband wants to wait a couple of more years but wouldn’t I be too old if we wait longer? mainly because I’m scared that having a baby at an older age is going to be more dangerous or so I’ve heard.