No, petroleum jelly should never be used vaginally.
Petroleum jelly is too thick for your vagina to clean out easily, thus it can trap bacteria within the vagina so increasing risk of infection - if used with tampons the petroleum jelly would also trap tampon fibres, this plus additional bacterial growth will increase risk of vaginal infections and Toxic shock syndrome. Petroleum jelly also acts like a barrier so would prevent moisture getting to vaginal tissues, this could cause vaginal dryness and increased vaginal tissue damage, this also increases risk of toxic shock syndrome.
If you need to sue lubrication when inserting tampons use water-based lubricants such as KY jelly or natural oils such as olive oil or coconut oil, another suggestion would be to masturbate as when aroused the vagina relaxes, opens, and lubricates.
Yes, it is safe; vaseline is a very mild agent.
Vaseline
It wouldn't hurt the baby, but why would you put in a tampon, if you're pregnant you don't have your period.
I hope you are not wearing a tampon when not on a period. This is unhealthy and if you are just starting your period you should not be using a tampon until you are older. The tampon box gives written as well as a diagram of how to put in a tampon. Follow the directions and read the warnings. This is very important.
Vaseline will dissolve the plastics slowly. Also, Vaseline will just make the cube feel slimy and greasy.
If you use correct absorbency for your flow then it should insert smoothly, if you struggle then you can use lubrication such as KY jelly or olive oil on the tampon - do not use Vaseline, it's not safe! You can also masturbate before insertion as when aroused the vagina relaxes, lubricates, opens, and increases in size. The most important thing is to relax, if you're tense vaginal muscles tense causing the vaginal canal to tighten so insertion is more difficult.
yes Vaseline can be used to shine the shoe and you only need a little
Every tampon box has detailed instructions with picture of how to put a tampon in. Very gingerly Follow the instructions in the pack.
you could put Vaseline on it will moisturise your skin.
You might be uncomfortable, and the tampon would not be able to expand and function normally.
Put a tampon in or use a pad.
Put a tampon in your but