There are cute mobiles out there designed clearly for the parent’s taste (or to match the nursery) but not for the baby. Small babies like bright colors and black and white patterns that they can clearly see. They like sounds and movements. My son had the earlier version of this mobile that is now out of production. My daughter got this one and she LOVES IT! She can spend easily half an hour watching it, if we let her. She is very excited, moves her arms and feet, and cooes while watching it. Very engaging. We had no technical problem with it and the battery has been running for over 4 months now with daily use and no replacement.
Tiny Love Classic Mobile