Error message-- Modded Co-Op

[concon123]

Hi y'all! My partner and I are playing modded 1.6.3 together. She's getting this error whenever we try to progress to the next day:

at StardewValley.Game1.Update(GameTime gameTime) in D:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Game1.cs:line 3199
at StardewModdingAPI.Framework.SCore.OnPlayerInstanceUpdating(SGame instance, GameTime gameTime, Action runUpdate) in SMAPI\Framework\SCore.cs:line 1083
[game] An error occurred in the base update loop: Microsoft.Xna.Framework.Content.ContentLoadException: The content file was not found.
---> FileNotFoundException: Content\Characters/Natural/Sebastian/Baby.xnb

Tldr I just had a kid with Sebastian when this started. Any ideas what the issue might be? Not sure if this is due to her cabin not being upgraded or a known issue. Mods she has:
-SMAPI (fully updated)
-Friends Forever
-Chests Anywhere
-Content Patcher