Hello Mamas, and all,
Replacing the fat is an awesome question, I agree with those who said coconut oil, olive oil (low temps), avocados, and omega 3 fat rich fish (in safe quantities of course, sardines great for this, when appropriate age).
I would also add after 4 months of age babes can have warmed though not cooked egg yolk. The egg white is off limits till later as the protein is too big and can cause sensitivities or allergies if ingested too early. The saturated fat in egg is fantastic for neural development and musculo skeletal coordination.
The nut butters are best if soaked in pure water with sea salt for 6 hours (almond, pecan) to decrease the phytates( which block mineral uptake) and make them more nutritionally available as recommended by weston price foundation and Nourishing Traditions with Sally Fallon.
Nuts are inherently inflammatory and in my opinion are best used as a condiment not a meal or even the main part of a snack. Each person is different, worth considering.
Sharon