- Honey, what a smell?

- The baby pooed. I have to change the diaper. I have only one pack of wet tissue. You have to buy wet tissue.
- OK. I will buy wet tissue on the Internet. Check the condition of the diaper of the baby frequently so that he may not have a rash.
- I know.
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Would you check the dialogue and correct errors? Thank you.

- Honey, what a smell!!

- The baby pooed. I have to change the diaper. I have only one pack of wet tissue. You have to buy wet tissue.
- OK. I will buy wet tissue on the Internet. Check the condition of the baby's diaper frequently so he doesn't get a rash.
- I know.

[However ... why would you buy wet tissue (baby wipes) on the Internet instead of a local store? Don't you need them now??]

I have only one pack of of wet tissue. should be i have one packet of tissue.

spelling mistake.

- Honey, what's that smell?

- The baby pooped. I need to change the diaper. I only have one pack of wet wipes left. Can you please buy some more?
- OK. I will order wet wipes online. Make sure to check the baby's diaper frequently to prevent a rash.
- I know.

The dialogue seems to be correct with minor changes made for better understanding and clarity.