You need to stop believing the garbage you get from dishonest professional Creationists and actually read up on the subject. Haeckel has become a fetish for they and lay Creationists alike, but his embryo drawings were not the entirety of embryological studies then or now.
http://www.talkorigins.org/faqs/comdesc/section2.html#ontogeny
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Example 1: mammalian ear bones and the reptilian jaw
From embryological studies it is known that two bones of a developing reptile eventually form the quadrate and the articular bones in the hinge of the adult reptilian jaw (first reported in 1837 by the German embryologist Karl Reichert). However, in the marsupial mammalian embryo, the same two structures develop, not into parts of the jaw, but into the anvil and hammer of the mammalian ear. This developmental information, coupled with common descent, indicates that the mammalian middle ear bones were derived and modified from the reptilian jaw bones during evolution (
Gilbert 1997, pp. 894-896).
Accordingly, there is a very complete series of fossil intermediates in which these structures are clearly modified from the reptilian jaw to the mammalian ear (compare the intermediates discussed in
prediction 1.4, example 2) (
Carroll 1988, pp. 392-396;
Futuyma 1998, pp. 146-151;
Gould 1990;
Kardong 2002, pp. 255-275). <<
He also cites, surprise, hind limb buds on cetacean embryos, just as I did in the OP which I explained happen because they have a the gene package for hind limb development as a molecular vestige of their terrestrial ancestry.