Order envelopes in advance so that you can write them before your baby is born. Our colored envelopes have a size of 13x18 cm, which match the size of our cards nicely. There is 1 stamp on the envelope for 1 card (and possibly a maternity card). If you need help choosing the right color, feel free to send us a message. We're happy to help. To complete the card completely, you can provide the envelope with a sealing stamp, which you can shop under 'extras.