He was hidden for 3 months before an "ark of bulrushes" was built for him
[DOC] [TLE] Exodus 2:3 But when she could hide him no longer, she got a ... [PAR] And when she could no longer hide him, she took for him an ark of bulrushes and 
... a son; and when she saw that he was beautiful, she hid him for three months.