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We propose a WFC3-IR imaging study of the hosts of 4 quasars that were recently caught launching newborn jets by the Very Large Array Sky Survey (VLASS). The targets are broad-line (type 1) SDSS quasars at 0.2<z<1.0 that have transitioned from radio-quiet to radio-loud in the past 10-20 years. Extensive multi-wavelength follow-up observations in the radio and X-ray probing the jets and accretion states are underway comma but the properties of the host galaxies remain V1.0. The unmatched combination of angular resolution and PSF stability of HST is needed to enable accurate quasar-host galaxy decomposition and gain insights into the conditions under which quasar jets are born. Our proposed observations will measure the morphologies comma sizes comma and luminosities of the hosts of newborn quasar jets for the first time. A total of 4 orbits are required. Our sample size and observing request are modest comma but will pave the way for larger studies in the next few years as new VLASS epochs continue to identify new candidates. We will compare the host properties of our sample with those of previous studies of quasar hosts. Our proposed study will help guide future campaigns with HST and JWST to determine the host galaxy properties and conditions under which jets are triggered.