Valmiki Ramayana Aranya Kanda Sarga 45 Shloka 39

सीता Sita, इति thus, लक्ष्मणम् to Lakshmana, आक्रुश्य दुःखसमन्विता blaming and crying in distress, रुदती crying, दुःखात् with grief, पाणिभ्याम् by her hands, उदरम् belly, प्रजघान ह hit herself.

Thus Sita cried in distress, sadly hitting her belly with both the hands, blaming Lakshmana (all the time).