  New photometric observations of seven intermediate mass pre-main sequence
delta Scuti candidates are presented. The periods and pulsation modes are
derived for two of these stars, namely HD 35929 and V351 Ori. The comparison
between observations and nonlinear pulsational models allows us to provide some
initial constraints on their mass and evolutionary state. As an illustration we
discuss the use of periods to identify the mode of pulsation in these two stars
and to have an independent estimate of their distances.
