The easiest way to add new calves to PastureMap is to import them as a new herd. See this article for more information. You can also enter the Sire and Dam of each calf if you upload an Excel file of animal records. Once the calves have been imported, you can move them into the same pasture as their moms and move the herds together in PastureMap. Alternatively, you can use the "Move to" button in the Herds tab to move the calves into an existing herd.
If you have new weight records to enter, you can upload the new weights into PastureMap.
If you need to update the calving date or other information for the moms, you can update those records from Excel.