One verse

Srimad Bhagavatam 11.7.60

11.7.60

तासां पतत्रै: सुस्पर्शै: कूजितैर्मुग्धचेष्टितै: । प्रत्युद्गमैरदीनानां पितरौ मुदमापतु: ॥ ६० ॥

tāsāṁ patatraiḥ su-sparśaiḥ kūjitair mugdha-ceṣṭitaiḥ pratyudgamair adīnānāṁ pitarau mudam āpatuḥ

tāsām
of the little birds
patatraiḥ
by the wings
su-sparśaiḥ
gentle to the touch
kūjitaiḥ
their chirping
mugdha
attractive
ceṣṭitaiḥ
by the activities
pratyudgamaiḥ
by their efforts to fly by eagerly jumping up
adīnānām
of the happy (children)
pitarau
the parents
mudam āpatuḥ
became joyful

The parent birds became very joyful by observing the soft wings of their children, their chirping, their lovely innocent movements around the nest and their attempts to jump up and fly. Seeing their children happy, the parents were also happy.