In 2004, LEGO released 5 Baby sets, all of these sets have been retired. For that year, the total price of all retail sets cost $68, today those sets are valued around $297, a growth of 337%.
Most valuable 2004 LEGO Baby set
5455 Stacking Jungle Set $137.30
5 sets

5436 Stack 'n' Learn

Theme Baby
Year 2004
Pieces 2
Availability Retired
5436 LEGO Baby Stack 'n' Learn
Retail $2.99
Value $6.12
Growth  +104.7%
Annual growth 3.3%

5453 Baby Elephant Stacker

Theme Baby
Year 2004
Pieces 6
Availability Retired
5453 LEGO Baby Elephant Stacker
Retail $9.99
Value $18.98
Growth  +90.0%
Annual growth 3.0%

5454 Stack & Learn Giraffe

Theme Baby
Year 2004
Pieces 5
Availability Retired
5454 LEGO Baby Stack & Learn Giraffe
Retail $9.99
Value $36.53
Growth  +265.7%
Annual growth 6.1%

5455 Stacking Jungle Set

Theme Baby
Year 2004
Pieces 8
Availability Retired
5455 LEGO Baby Stacking Jungle Set
Retail $24.99
Value $137.30
Growth  +449.4%
Annual growth 8.1%

5458 Pull Along Duck and Duckling

Theme Baby
Year 2004
Pieces 7
Availability Retired
5458 LEGO Baby Pull Along Duck and Duckling
Retail $19.99
Value $97.93
Growth  +389.9%
Annual growth 7.5%