The has expanded its base game to include infants as an aging stage between newborns (formerly babies) and toddlers. Infants have a larger range of interactions than newborns as they explore the world. Players can monitor their moods and needs in the same way as grown Sims, further enhancing the realism of the game. Players with the Expansion Pack can work towards infant milestones, giving the infant a wider range of actions and truly developing them before becoming toddlers.
The Expansion Pack allows players to explore more realistic family dynamics with their Sims, fleshing out relationships throughout the game. All age groups have their own Milestones that can affect their development and growth. The infant milestones focus on developing fine and gross motor skills, social interactions, and «firsts» such as the first bath.
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One of the main categories for infant milestones in the is Fine Motor skills. Fine Motor focuses on the infant's ability to manipulate their hands and fingers with the same grace and control adults take for granted. Most milestone categories for infants must be unlocked in chronological order while playing as an infant in the .
Infants unlock Fine Motor milestones in the following order: Learned to Reach, Learned to Grab, Put Toe In Mouth, Learned To Wave, Learned To Clap, and Learned Pincher Grasp.
Players unlock Fine Motor infant milestones in the by allowing their infant to play with toys or other utensils. Initially, adult Sims must give the infant the toys needed, but eventually, the infant can grab toys by themselves. The more the infant plays with toys, the more likely they will unlock a milestone.
Gross Motor is a
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