kuksau

samasta-kukṣau — everything is within the abdomen; SB 3.15.33
kukṣau — in the abdomen; SB 3.31.4
kukṣau — towards the belly; SB 3.31.8
kukṣau — in the womb; SB 4.8.11
kukṣau — within the abdomen; SB 10.14.17