follow, weeping child
啝 centers on following or accompanying, with a secondary, rarer sense of a weeping child. The two meanings do not share an obvious conceptual center; the following sense is the main one, while the weeping child sense may be an obscure or archaic usage.
啝 is a phono-semantic compound: 口 (mouth) suggests vocal expression, and 和 (harmony, peace) likely provides the sound. The exact historical development of the meanings 'follow' and 'weeping child' is uncertain.
A mouth 口 beside harmony 和: imagine a child following a parent's harmonious voice, or a weeping child being soothed by a calm, harmonious tone.
For ワ, picture a child following a parent and crying 'Wa!' The sound 'wa' cues ワ, and the weeping child follows the parent.