Baby fever at 39, husband not convinced (xposted, children mentioned)

onemoremaybe

I am 39 and have 3 children. I feel very blessed and I am grateful for my family. However, for the past year I feel like our family is not complete. Almost as if I know that another baby is waiting for us. Sounds crazy but I don't know how else to word it.

So even if life is quite hectic with 3 children under 6, I am ready for #4. Everybody, including my husband,  seems to think it is a bad idea for the following reasons:

1) I am too "old" 

2) I am too fat and being overweight adds pregnancy complications

3) My hands are already full with 3 children

4) Another baby means going back to sleepless nights and restrictions in lifestyle (like traveling, etc.)

My rational mind tells me these are valid points. My emotional mind says BS. 

Like I said, I know I should be grateful for what I have. But how can I block this strong desire for another baby? Nobody around me wants to talk about it. I need to vent and I would really appreciate advice.

Thank you in advance!