If you've uploaded at least 23 photos taken during the previous month, you should receive monthly photo print suggestions early the following month.
If you haven't uploaded 23 photos, please try adding more to your album.
Even if you've uploaded 23 photos, it's possible you might not receive photo print suggestions if your photos from that month are too visually similar. If you think this may be the case, try uploading more photos taken in different areas or from different angles.
Once you add more photos, you should receive your photo print suggestions within a day.