Mamas are particularly protective of their young. They won't allow you approach their young.
If their offspring are left alone, the mom won't return. Touching the infant may scare mom away.
Animal moms sometimes let you view or touch their newborns. That shows trust, or they need assistance.
Take @bernie doodle's TikTok for example. The video creator heard noise outside. Her driveway duck was making the noise.
The inventor saw the ducklings were caught in a storm drain. This duck mom's request for aid is excellent and shows that it's never wrong to ask.
How sweet! We can't image what the duck thought when she couldn't reach her kids. She was desperate, so she honked loudly.