I'm not quite sure there are any direct connection between common christian symbols and the womb although one that is found commonly is the chalice or holy grail, said to hold the blood of christ i.e life in the womb
In His mother's womb
The most widely known Christian symbol is the cross. Other Christian symbols include the fish sign, Greek symbols alpha and omega, staurogram, anchor, and dove.
Some common Christian symbols include the crucifix, the ichthys and the staurogram. You can get more information about these symbols and more at the Wikipedia. Once on the website, type "Christian symbolism" into the search field at the top of the page and press enter to bring up the information.
the swastika
constantine
The question is ambiguous as there are no Christian 'symbols.' Perhaps you are asking about astronomical or zodiak signs in which case this question is better placed in astrology and not Christianity.
The cross is the main one, the fish is another.
A cross and a fish
The cross and love.
H. Child has written: 'Christian symbols'
Christian sweatshirt designs tend to have symbols related to the Christian faith. These include crosses and bibles. They are also available with Christian messages such as 'Pray Believe Receive'.
Justina Knapp has written: 'Christian symbols and how to use them' -- subject(s): Christian art and symbolism