Invitations for the 30th anniversary are send when you plan to celebrate your 30. birthday. Usually such invitations are send using birthday invitation cards. You can buy ready to send cards for this anniversary and just insert some custom words and information like the place and time of the birthday party or you can create you own invitation cards using a computer. There are also some websites which allow online creation of custom invitation cards. You just have to select a picture, insert your own text and print it. You should also include some funny birthday sayings or quotes.
Congratulations for a Baby Birth are send to the parents when a baby is born. With baby congratulations you wish the best for the parents and for the just born baby. You can make such congratulations on the phone. The mother may still stay in hospital. Alternatively, you send a greeting text in a SMS message using you mobile phone. Congratulations to the baby should only be made in case of a successful birth and a healthy baby. "We are very happy for you and the newborn baby" is a classical example for a congratulation text. Many other phrases can be found online. You should also send a gift to the parents - a godd idea is a set of two picture frames - one to keep and one to send back. This way you request a photo of the baby.
For a baptism of a baby the grandparents and other relatives and friends are invited. You can buy ready made invitation cards for the christening or baptism, but such cards usually look very classic and not very personal. Invitations for baptism can also be made by yourself. A nice idea is to take a picture of the baby and write some texts and phrases on the back of the picture and send it out as an invitation. You can either label the photo directly using your computer or edit the photo and add some text. When you make your own cards you should keep in mind to use the format of a postcard so you can put it easily into a standard envelope.