A folding collapsible frame structure for baby trailer is disclosed to include
a bottom frame unit having a transverse front bar curved downwards without hindering
movement of a young child in and out of the baby trailer, two upright side frames,
respectively pivoted to the bottom frame unit at two sides, a transverse top bar,
male and female coupling members respectively provided at the upright side frames
and the ends of the transverse top bar for enabling the transverse top bar to be
detachably connected between the upright side frames, a trailer bar pivoted to
a bottom U-lug at the bottom frame unit and selectively locked between the extended
position and the received position by a spring-supported locking member, which
is coupled to the trailer bar by a slip joint.
