When you only have the birth date, your child's poster will have 6 pieces of content instead of 7.

From their Astrology Natal Chart:

Sun Sign - How you see yourself and who you're learning to be.

Jupiter Sign - Your super skills, the things that will expand you and bring you abundance.

North Node Sign - Your destiny or life path . . . the direction you are here to go in.

Chiron Sign - Your core wounds and healing gifts.

Saturn Sign - The great lesson you're here learning.

From their Human Design Bodygraph:

Energy Type - The energy you were designed to bring to the world and how you best interact with the world.

When you have the all the birth details, the poster includes 7 pieces of content (two Human Design and five Astrology pieces) and more of a 'life purpose' feel.